Explore how Sanborn fire insurance maps used color-coded buildings and symbols to chart American towns building by building.

An archive of the art of the Sanborn fire insurance maps

For a century, US insurance companies used Sanborn Fire Maps to decide the premiums customers would pay for fire insurance. These maps were designed to show the building materials used in each structure in 12,000 communities across 300,000 maps. While they have become obsolete, these maps are still useful for historians and urban designers, and anyone interested in lovely, original typography. Dive into the most artful Sanborn Fire Maps with this passion project collection.

Red and blue election maps are a modern media invention

The red–blue color scheme used on election night maps emerged in the 20th century as television networks adopted color graphics to make results easier to follow. The association of red with Republicans and blue with Democrats later became standardized.

Explore a real-time map of fine particle pollution from wildfires and other sources provided by the US Forest Service, which includes overlays for topography, street views, and satellite imagery.

Search this digital archive of 19th-century "panoramic" maps of US and Canadian cities

The panoramic map was a popular cartographic form used to depict U.S. and Canadian cities and towns during the late nineteenth and early twentieth centuries. You can peruse a gallery of almost 2,000 of them in this digital archive from the Library...

Visualize network coverage for mobile carriers worldwide with maps of crowdsourced latency and download and upload speeds.

Explore weekly and historical maps of drought conditions across the US, alongside regional summaries of drought conditions, with the US Drought Monitor.

How house colors can indicate gentrification

Reporters from the Washington Post share an analysis that indicates gray and neutrally toned houses are signs of gentrification in a neighborhood. Visuals of different paint swatches help illustrate which colors are chosen for newly built homes in certain DC districts.

View a fall foliage prediction map to estimate the progressive change in the color of leaves throughout the US from September to mid-November.

Visualizing the symbols and history of world flags

More than 200 world flags feature high-intent designs, projecting ideals and values to the world through archetypal symbols, colors, and shapes. This page effectively depicts the data behind symbol and shape usage, how much each country's flag has changed over time, the most popular colors used, and more in a series of elegantly simple charts.

Nineteenth-century, hand-drawn infographics on US slavery and race

In the second half of the 19th century, researchers studying the behavior of the millions of emancipated Americans after the Civil War used "information graphics" to cut through the noise of racially charged debate. In this collection from Stanford, you can see century-old, stunningly hand-drawn data visualizations showing racial demographics, the effects of emancipation on cotton prices, and more.

Track active wildfires, floods, and other natural disasters across the US in real time with this interactive map.

Clark’s maps provided the first detailed record of the American West

Covering over 8,000 miles, William Clark’s maps charted rivers, mountains, and tribal territories with remarkable accuracy. Equipped with sextants, compasses, telescopes, and more, Clark became an expert at surveying—requiring extensive celestial and topographical observations each day.

Vintage 1980s photos of the streets of San Francisco

In the early 1980s, San Francisco was changing amid increased diversity and a nascent tech boom. This series of photos from 1981 and 1982 was found of the evolving city, depicting trolleys, doorsteps, storefronts, and more from a time very different from today. Explore the vintage shots here.

A history of raising the alarm, from rattles to 911

Because fires spread so quickly, communities around the world have deployed many tactics to raise the alarm to get help. This history from the Museum of Natural History dives into the use of rattles, bells, and brigades to gather help to fight fires, showing just how far we've come since 911 was introduced in 1968.

Zoning laws determine what can be built—and where—in every American community

Local governments use zoning to regulate land use. About 75% of residentially zoned land in American cities is designated for single-family homes only—a restriction that some experts blame for increasing housing costs and reducing affordability.

37 maps that explain the American Civil War

This collection of 37 maps tells the story of the American Civil War as well as any historical account. See how and where the war began and why, and where the major battles were fought. Discover how the North achieved victory and the many ways the war changed America forever.

Mapping fiction's imagined breakdowns of the US after apocalypse

Post-apocalyptic fiction in the US is at least a century old, and how the future is envisioned reflects contemporary anxieties and divisions. This piece examines the various creative maps birthed from the tradition from Jack London's 1912 "The Scarlet Plague," a pandemic novel set in 2073, through Stephen King's "The Stand", dystopian "The Hunger Games," and visions of civil war.

View a map of America's regional pizza styles

It may all be pizza, but it's not all the same. From California to New York and from Quad City-style to Old Forge, this interactive map of the US lets you see the country's different takes on the classic dish.

A map of slavery's spread across the US

Need a visual on how prevalent slavery was in the US? Scroll through this interactive map and timeline based on census data from 1790 to 1860.

Snowfall records from every county in the US

Discover the one-day snowfall records of every county in the US in this comprehensive map. Data from the National Oceanic and Atmospheric Administration captures inches of snowfall and the year it fell the most in each county. See the contrasts between the inches of snowfall in warm southern American states and the cooler East Coast.

In 1974, Los Angeles’s Community Analysis Bureau built a smart city

Los Angeles utilized aerial imaging and cluster analysis to gather and interpret civic data, leveraging surveillance technologies developed by the Department of Defense during the height of the Cold War. Instead of being used for military purposes, data insights helped direct social services to high-poverty neighborhoods.

Explore a collection of famous literary maps, including original images from 'Treasure Island,' 'The Swiss Family Robinson, ' and 'Walden.'

Explore r/ColorizedHistory, a Reddit community that collects colorized versions of black-and-white historical photographs, from Olympic podiums to family portraits.

A map of Barcelona from 150 BCE to 2010

Watch Barcelona evolve from Iberian settlements in 150 BCE to Spain’s second-largest city in the modern day by toggling this chronological series of 27 maps. Accompanied by a short contextual blurb, each map shows Barcelona’s steady urbanization over more than two millennia. For those captivated by the interactive, read this interview with one of the project’s key cartographers. He discusses how the mega-map was created and what it reveals about Barcelona’s history.

An interactive map of race and ethnicity across the US

This map by CNN shows race and ethnicity across the United States. America is more diverse and has more people than ever before. According to the 2020 census, much of its growth is occurring in and around metropolitan areas. By plotting the US...

The creator of 'The Simpsons' made his characters yellow so they would contrast with everything else on TV.

George Washington was an expert in maps and cartography

Trained as a surveyor, Washington routinely studied, annotated, and drew maps throughout his life. He relied on cartography to navigate frontier lands, plan military campaigns across vast distances, and make strategic decisions on borders, settlement, and governance.

An AI-built pixel map reimagines New York City as a video game

Isometric NYC is a zoomable pixel-art map that renders the city in game-style perspective (think SimCity), helpfully clarifying the dense geography and architecture. The makers built the project tile-by-tile using satellite data and generative AI. Zoom into building-level views or out to see all five boroughs.

Mapping early New York

Want to see how Wall Street (and New York City as a whole) has changed over time? Use this timeline and map to see Manhattan today overlaid with the precise boundaries of early land grants to the Dutch in the 1600s. Scroll through the progress of city building through the first century of European settlement there.

A collection of contemporary maps from World War II

Newspapers published detailed maps of the conflict in real-time. See different portrayals of the situation, ranging from propaganda maps to speculative maps about the war's outcome. The fascinating depictions reveal how maps can show us the aspirations and intentions of different players in a global conflict.

Red is deeply symbolic in Chinese culture

Since the bold hue warded off the mythical Nian, the color red has come to represent luck, prosperity, and celebration. If you come across a home or neighborhood preparing for new year celebrations, you'll see red lanterns, wall hangings, clothing, and more.

See the evolution of Super Bowl logos and how the NFL refined its visual identity over time

Tracing Super Bowl logos from early, varied designs to today’s standardized look shows how the NFL adapted to shifting design trends, television demands, and brand strategy.

See a timeline of colonial settlement in North America.

Homes in areas increasingly prone to natural disasters often aren't covered by private insurance

Instead, they're often covered under insurance plans of last resort, known as FAIR (Fair Access to Insurance Requirements) plans. However, as more and more homes become covered by FAIR, the program is facing strain. This interactive visual helps explain the new problems FAIR is facing.

Explore how 10,000 different American cities got their name.

Discover the chemistry behind smoking foods, including the types of smoking and the source of smoking flavors and colors.

Fireworks make a loud booming sound after explosion due to air expanding faster than the speed of sound.

American local government comes in five distinct forms

Counties, municipalities, townships, special districts, and school districts are each created for a different purpose, operating under different rules, and answerable to the state in different ways. Special districts, the least known of the group, are created for specific purposes, such as transit or fire protection.

Create digital maps of Earth with custom sketches and labels

In this interactive, users can apply layers to various base maps to display natural and human features, including geological activity, biomes, ocean currents, population densities, and light pollution. Custom legends, markers, and drawings can be used to highlight prominent features.

View a map of US data center infrastructure in 2025

Thousands of data centers across the country have already been built, with more under construction or planned. Facilities are connected via transmission and fiber optic lines, with the latter spanning an estimated length of 160 million miles.

Fireworks' chemical composition and internal layout produce their unique displays

The burning of different metal compounds, facilitated by combining fuel with oxidizers, results in explosions of varying colors. The timing and pattern are engineered through the arrangement of pellets and fuses.

Learn about the plant and animal species in every US county that are federally protected under the US Endangered Species Act with this interactive map.

Colored paint lines on new tires mark different types in the factory

Each stripe helps warehouse workers and distributors identify tire types at a quick glance. This innovation became important a century ago as manufacturers scaled operations and developed distinct product lines.

Guess US city populations via bracket-style game

The US Census Bureau's data visualization team created a game—laid out like a March Madness basketball bracket—where you try to decide which metro area of two has the greater population. Test your knowledge of relative city populations and see...

Color originates from the brain processing light of varying wavelengths

Various geometric models, including Newton's color circle of hue and saturation and the horseshoe-shaped XYZ space for mixing colors via vector mathematics, have been proposed to describe colors accurately. However, these models do not encapsulate the variety of psychological effects that cause perceived colors to differ from mathematical representations.

See how a 2018 fire in Paradise, California, exposed the limits of emergency coordination

This Frontline documentary shows how the Camp Fire stretched and ultimately overwhelmed the complex web of agencies involved in emergency response, including fire suppression, 911 dispatch, law enforcement, and emergency management, with catastrophic results.

Power lines are dotted with large, brightly colored balls to improve the visibility of these thin wires to helicopters and small planes and help prevent potential crashes.

See how fireworks are made and which metals are responsible for different colors.

Explore the chemical compounds found in fireworks

Besides the various salts and metals used to produce fireworks colors, shells are also filled with gunpowder and oxidizers to help fuel and accelerate reactions. Chlorates help strengthen colors, while dextrin, a starch, helps hold mixtures together.

Visualize the components of fireworks

This article provides animated diagrams depicting how different parts of fireworks function. The elements work together through timed mechanisms to produce desired effects.