Leaning Italian tower could fall after nine centuries

Explore the world's most famous leaning towers and structures

Pisa gets all the fame, but the quirk of a tilt adds precarious charm to dozens of famous buildings around the world. There are Pisa replicas, but also old castle towers, crooked houses and tilted churches and mosques.

A Manhattan building doomed to collapse was saved in secret

After completing the Citicorp Center, its engineer realized that cost-cutting measures to use bolted instead of welded joints made the building vulnerable to collapse under quartering winds. For three months, crews worked in secret at night to reinforce the building under Project Serene.

The ancient engineers inspiring modern building practices

Modern concrete structures need replacing every 50 to 100 years, so why are buildings by the Maya, ancient Rome, and ancient China still standing strong? This article details how scientists are looking into humanity's past for clues on how to craft long-lasting structures. Part of the problem is adopting old material recipes to hold up to modern demands.

Engineering tall structures requires managing wind, earthquakes, and other destabilizing factors

Reinforced concrete, energy dampers, braced frames, flexible structures, and aerodynamic decks were among the methods implemented when building structures such as the Shanghai Tower, the Texas Super Skyscraper, and the South Rangitīkei Viaduct.

Fascinating photos of abandoned Italian churches

Whether cloaked in thick moss and debris or almost entirely preserved, the abandoned churches photographed by Roman Robroek document the effects of a changing landscape. At least 1,000 of the religious spaces are left unoccupied in both small towns and cities throughout Italy and stand in varying stages of decay.

A nearby super volcano poses an even greater risk to Italy than Vesuvius

The Campi Flegrei supervolcano, with over half a million residents nearby, may be the region’s true threat. This BBC short shows how scientists monitor Campania’s volatile geology—and why people remain drawn to the landscape despite the danger.

Machu Picchu, 101

Machu Picchu was built right on top of two intersecting fault lines, which makes it even more baffling how its temples and terraces have survived for more than 500 years—especially since no mortar was used to hold the precisely cut stones together. As this three-minute NatGeo video explains, this ingenious construction method allows the stones to bounce in place when earthquakes hit, shaking and rattling but rarely collapsing.

Techniques to earthquake-proof a building include the use of counterweights, such as a massive column or pendulum, to dampen the impact of seismic activity and isolating a building's structure from its base.

Italian banker catches 3-year-old girl falling from a fifth-floor balcony

In Turin, Italy, in August of 2023, a man walking to the bakery with his girlfriend became a hero when he saw a 3-year-old girl climbing out of a fifth-floor window. This article collects social media posts around the incident and explains what...

In the summer months, the Eiffel Tower grows a few millimeters and leans slightly to one side because sunlight warms the metal, causing it to expand.

The impressive walls of Constantinople

This video explores the land walls of Constantinople, built on the orders of Theodosius II in the mid-fifth century. They consisted of a triple line of defenses, studded with hundreds of towers and supplemented with a moat. The walls were besieged dozens of times, but were only broken in 1453 by the power of Ottoman cannons. As repaired by the Ottomans, the walls are still largely intact today.

Structures from ancient Rome have endured for millennia because tiny pieces of lime in Roman concrete enabled it to self-heal and prevent cracks from spreading when exposed to water.

Wildlife use Rome's sprawling archaeological sites as urban havens

The Italian capital features some of the world's most famous monuments as the inheritor of ancient Rome's grandeur. This photo essay explores the city's vibrant collection of wildlife, including long-concealed native crabs, peregrine falcons, and the beaver-like nutria.

Watch the Arecibo Observatory collapse

Watch this remarkable footage of the Arecibo Observatory's 900-ton platform falling into the 1,000-foot wide (305 meters) dish below, followed by footage from a drone coincidentally observing the cables at the time they snapped.

Why Water Towers Are Built This Way

The high-tech mechanisms of the Roman Colosseum

The Roman Colosseum is one of the most iconic amphitheaters in the world and still partially stands today. Aside from its sheer size, the arena was equipped with some of the most high-tech engineering from the classical world, including sophisticated lifts, a huge retractable awning, and an underground network of tunnels, elevators, and trapdoors.

Watch a 3D animation of Pompeii's final day.

Tombaroli steal precious items from ancient people's tombs in central Italy

The tombaroli, or tomb-robbers, raid ancient Etruscan tombs in the dark hours of the night to recover vases, statuettes, mirrors, ornaments, jewellery, and other objects in gold, bronze, and terracotta. Read a firsthand account of a tombarolo who made a living handing stolen items to middlemen who sold them to wealthy buyers abroad. The lives and practices of tombaroli are also explored in the 2023 film "La Chimera."

The mosaics of San Vitale, Italy's Byzantine city

This video explores the unique artistic heritage of Ravenna, the center of Byzantine power in Italy. The city’s churches and baptistries still sparkle with a dazzling array of Byzantine mosaics. The most famous of these, in the Church of San Vitale, show Justinian and his wife Theodora with their courtiers. A visit to Ravenna – or at least a look at this video – is highly recommended to anyone interested in Byzantine history or art.

Chicago's Rookery building, completed in 1888, is America's oldest skyscraper and was part of a campaign to rebuild the city after its Great Fire.

How did the Inca build Machu Picchu?

How did the Inca, a people without iron or steel, build a city that has withstood hundreds of years of earthquakes and inclement weather? Machu Picchu stands atop steep landslide prone slopes and active fault lines and gets up to 80 inches of rain...

Experts reconstruct Pompeii’s daily life—and whether disaster could strike again

This documentary utilizes archaeology, X-rays, and 3D reconstructions to reconstruct what the streets, homes, and rituals of Pompeii looked like before 79 CE. Scientists also use satellite imaging to track landslide risks that could damage the site today.

A $7.5M renovation aimed to protect Fallingwater from climate-related damage

The exhaustive plan took over three years to reach the finish line. The majority of the expenses went toward hiring skilled laborers to address issues such as water damage in the unique location.

Visualize ancient Rome in 3D with this aerial view

Researchers have compiled meticulous representations of ancient Rome in this video game-like depiction of the Eternal City from the air. For eight minutes, viewers can take in what Rome looked like two millennia ago, from the terracotta-topped homes to the Forum and Colosseum.

Why are ancient ruins underground?

When cities fall into disrepair, it's often easier to flatten what you can and build on top. This is why modern archaeologists frequently discover ruins underground, revealing generational layers of cities rebuilt over time. This video explores major examples of this principle, from ancient Troy to even modern Seattle.

The Bomb-proof, Cold War-era New York data center inspiring spy movies

At 33 Thomas Street in Lower Manhattan, New York City, a 45-story concrete tower with no windows stands imperiously over the city. Inside, 18 floors of telecommunications technology have hummed for decades. The building's purpose—to protect US comms from nuclear fallout—and its design have played into spy movie plotlines. Dive into the building's curious role in pop culture with this long read.

'I ought to be jealous of the tower. She is more famous than I am.'

- Gustave Eiffel (1832–1923)

The last Inca grass suspension bridge in Peru

High in the Peruvian Andes, the aging Q’eswachaka bridge sags precariously over the Apurímac River. It has been built and rebuilt continuously for five centuries. Read more about it here.

Eleven architects collaborated to create the UN building in NYC

Renowned leaders in the field, accustomed to control over their projects, had to work together to complete the building. This quick article explores the tensions and cooperation of the architects to complete the UN building.

Nikola Tesla's original laboratory was recognized as a historical site in 2018

Beginning in 1901, the Wardenclyffe Tower was built on Long Island, New York to transmit electrical power through Earth's atmosphere. The project was abandoned before becoming operational due to limited funding, and was demolished for scrap in 1917 to help pay off Tesla's debts.

A medieval Italian visits Constantinople

In the tenth century, the Holy Roman Emperor Otto I sent Liudprand of Cremona, an Italian bishop, to Constantinople on a diplomatic mission. He was not successful. But the very undiplomatic report he sent back to the emperor about his experiences provides a unique – and often very entertaining – look at life and ceremony in the Byzantine capital, dramatically different from anything in Liudprand’s Italy.

Medieval hospitals existed centuries before modern medicine

Long before modern healthcare, medieval Europe established hospitals that served multiple roles, including religious, social, and medical purposes. This podcast explores how institutions like Siena's Ospedale di Santa Maria della Scala supported urban and rural communities for centuries.

Watch a time-lapse of the installation of the New Safe Confinement structure

The world's largest movable metal structure was built to contain the radioactive material from the 1986 Chernobyl disaster, which had previously been confined within a structure built to last no more than 30 years. The new structure was slowly rolled along rails over the course of two weeks.

A list of the world's best pizzerias

Italy may be pizza's ancestral home, but it's not the only place where you can get a top-notch slice. This guide, compiled by a team of anonymous judges, ranks the 50 best pizzerias in the world, Italy, the US, and more, offering a bucket list for pizza-loving completists.

The word 'influenza' comes from a 15th-century Italian belief in the stars

In Renaissance Italy, epidemics were thought to result from the influence of natural disasters or celestial bodies. The illness was named "influenza", meaning “influence” in Italian.

In 1963, a basement renovation in Turkey revealed a passageway to a hidden, multilevel underground city that once housed as many as 20,000 people.

Hagia Sophia, Istanbul's most famous and controversial landmark

A short video about the iconic Byzantine church. Still Istanbul’s most famous and, since its reconversion to a mosque, most controversial building. The recognizable dome has partially collapsed several times over the centuries, but remains a marvel of engineering. The mosaics, though fragmentary, are among the finest ever created and trace both the gradual evolution and the remarkable continuity of Byzantine art.

Da Vinci’s ingenious self-supporting bridge

Without using glue or nails, the brilliant polymath Leonardo Da Vinci was able to construct a sturdy bridge of wood logs. This video unpacks the genius civil engineering behind this concept and offers a visual demonstration of how it worked. See how Da Vinci accomplished this feat without using permanent parts, and how his bridge got even stronger as weight and force was added.

When Mount Vesuvius erupted in 79 CE, it buried the Roman city of Pompeii under 20 feet of ash, which preserved it for nearly 1,700 years.

Florence as it was: a digital reconstruction of a medieval city

Florence, Italy, is widely considered the birthplace of the Renaissance in Europe, where artists, poets, architects, and entrepreneurs renewed interest in ancient cultural forms. Using data from primary works, researchers have created a digital reconstruction of the city where users can explore buildings, artworks, and more.

Why only one of the seven wonders of the ancient world still exists

Greek writers recorded lists of great structures that were later codified by Renaissance writers. The definitive list includes the Colossus of Rhodes, the Giza Pyramid (the only existing one today), the Hanging Gardens of Babylon, the Temple of Artemis at Ephesus, the Statue of Zeus at Olympia, the Mausoleum at Halicarnassus, and the Lighthouse of Alexandria.

Fascinating 3D animation shows how Romans built roads

Highly efficient engineering and materials production allowed Roman administrators to lay down nearly 50,000 miles of roads across the ancient empire. These roads were built so effectively that many are still around today. Watch this quick 3-minute video to see how they did it.

The construction of LIGO needed to compensate for Earth's curvature

Across the 4-kilometer (2.5-mile) arms, the height of Earth's surface falls by almost a meter, preventing the lasers traveling within the arms from meeting the mirror at the end of each. Concrete slabs built beneath the arms help keep them level and provide structural support against seismic vibrations.

A virtual visit to La Sagrada Família

La Sagrada Familia is Catalan architect Antoni Gaudí’s magnum opus. The ornate Catholic church has been under construction since 1882, and the main structure isn’t expected to be completed until 2026. Decorative detailing won’t be finished until 2034. Even though it’s a work-in-progress, it’s open for tours, including from a computer screen. Click the link for a 360 view of the iconic church from 10 different vantage points.

The western Roman Empire fell in the 5th century CE amid invasions, weakness

A mix of over-expansion, political instability, a weak military and economy, and the broad invasion of the Eurasian Huns prompted the downfall. Its eastern half, the Byzantine Empire, would last for another millennium.

The art and architecture of the devastated Pompeii

Long buried under feet of ash, the city of Pompeii's discovery millennia later sparked a world of imagination and tragedy. See a collection of paintings, buildings, and photographs from the city all in one easy-to-browse gallery.

Twelve centuries of Roman history in 20 minutes

The Roman Empire may have been the world's first example of globalization, covering thousands of miles and crossing language barriers armed with Latin and short swords. Its legacy is nearly unparalleled in contemporary Europe, with nearly 50 Romance languages deriving from Latin.

In the original 2004 blue zones study, which sought to verify the ages of long-lived, healthy populations in Sardinia, Italy, researchers hypothesized that inbreeding in these isolated communities may have helped promote their longevity.

Legionnaires' disease is a serious lung infection caused by Legionella bacteria, and it's often contracted from inhaling contaminated mist or water.

Niagara Falls is slowly eroding backward toward Lake Erie

At its current erosion rate of roughly one foot per year, Niagara Falls is expected to retreat all the way to Lake Erie in about 50,000 years.