See L'Enfant's original plan and vision for DC and the National Mall

The 1902 McMillan Plan reimagined the National Mall as a formal, open civic space

Drafted by the Senate Park Commission, the McMillan Plan called for the removal of railroads, markets, and industrial uses from the Mall; revived key elements of Pierre L'Enfant's original layout; and established the framework for the Mall's long lawns, museum placement, and monumental core.

Washington, DC, was designed by French-born architect Pierre L'Enfant

Pierre Charles L'Enfant was an engineer who fought in the American Revolution. George Washington chose him to design the capital for his military service, artistic training, and vision of a monumental national city.

The National Mall once had canals and rail lines

In the 1800s, the National Mall looked nothing like it does today. Canals, rail lines, markets, and industrial uses crisscrossed the Mall before later redesigns cleared it into a unified civic landscape.

Take an architectural walking tour of the National Mall

Architect Nicholas Potts leads a walking tour of the National Mall, noting that many buildings adapt European neoclassical styles into an American form, such as replacing traditional motifs with corn cobs on the columns of the US Capitol building.

The unbuilt monuments of Washington, DC

The capital city of the United States famously was built in a swampy area, with dozens of memorials, monuments, and more spanning its vast and complex design. This video explores five monuments that were either built or were rejected as alternatives in the sprawling District of Columbia on the banks of the Potomac River.

The National Mall hosts one of the country's largest July Fourth fireworks shows

Each Independence Day, the National Mall hosts a massive fireworks display coordinated by the National Park Service, drawing hundreds of thousands of spectators to the nation's capital.

Americans touring the Louvre were inspired to create their own grand museums

The one-time royal residence was first transformed into a public museum in 1793 amid the French Revolution. Americans visiting in the early 1800s were both turned off by the aristocratic grandeur and compelled by the open access to the public. James Fenimore Cooper, the author of "The Last of the Mohicans," apparently came and measured the length of galleries.

The Compromise of 1790 broke a deadlock over debt and the national capital

In 1790, Alexander Hamilton, James Madison, and Thomas Jefferson reached an agreement that allowed Congress to assume the states' war debts and to approve a permanent national capital on the Potomac River.

The Lincoln Memorial was almost never built

The Memorial faced years of opposition from Speaker of the House Joseph Gurney Cannon, who blocked it for nearly a decade, arguing that the swampy land west of the Mall was an unfit and undignified site to honor Lincoln.

Washington DC's streetcar network built the modern American suburb

Washington's first electric streetcar line launched in 1888, and real estate developers quickly built lines to open new neighborhoods. A 35-minute ride from Chevy Chase, Maryland, to downtown Washington transformed farmland into a suburb.

Eliza Scidmore advocated for planting cherry trees in Washington, DC, in the early 1900s

The first female writer for National Geographic, Scidmore championed planting Japanese cherry trees around the Tidal Basin in Washington, DC. Her idea succeeded in 1912, after years of lobbying, creating one of the National Mall's most enduring traditions and tourist draws.

Washington DC's first public library, built in 1903, now operates as an Apple store

The Carnegie Library served as DC's central library until 1972, when overcrowding forced a move to the Martin Luther King Jr. Memorial Library. After sitting unused for five years, the building changed hands several times before Apple agreed to restore it and open a store there in 2016.

Paris and Boston were redesigned partly to combat cholera's spread

Georges-Eugène "Baron" Haussmann, who oversaw Paris's redesign in the 1800s, replaced many of the city's narrow streets with wide boulevards. This was done at least in part to bring more air and light into the city to help control cholera. Architect Arthur Gilman redeveloped Boston's Back Bay to similarly combat cholera, among other reasons.

Edith Roosevelt's White House redesign created the modern West Wing

In 1902, first lady Edith Roosevelt oversaw a significant renovation that separated the family residence from official offices. Architect Charles McKim added the West Wing to house the president's staff—establishing the modern layout still used today.

The Greek city of Alexandria in Egypt helped form the template for modern cities

It was designed by Dinocrates, who studied under Hippodamus, the father of urban planning. Hippodamus preached that urban planning should take into account function, culture, and politics. Dinocrates' design of Alexandria meant applying Hippodamus' teachings on a scale never before attempted.

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.

The iconic National Parks posters were the product of a New Deal arts initiative

Ranklin Delano Roosevelt established the Works Progress Administration in 1935 as a part of his New Deal. The program was intended to both create American jobs and inspire regular citizens through art. The Federal Art Project, as a part of the WPA, employed over 5,000 artists to work on projects, including the now-iconic National Parks posters.

Cities and parks often work to prevent graffiti

Although some call it art, many see it as an eyesore and try to prevent it through prohibitive designs, lighting, and vandal-proofed coatings that make spray paint easier to remove. This guide from the Project for Public Spaces outlines some of those strategies and more.

The US finished what the French had started with Panama's canal

For about two decades, Suez Canal-builder and Frenchman Ferdinand de Lesseps led the project, but financial troubles forced it into the hands of the US, who completed it in 1914. This timeline, made to accompany the definitive PBS American Experience documentary about the canal, highlights major moments in its construction.

Madison Square Garden and Madison Avenue are indirectly named after James Madison

Madison Square Park was named for James Madison in the 1800s. Madison Avenue later took its name from the park, and Madison Square Garden was named after Madison Square, indirectly linking both landmarks to Madison.

Jefferson omitted a plan to go beyond the Louisiana Territory in his funding request

In January of 1803, the president sought $2,500 to fund the expedition (though it likely cost closer to $50,000). The ostensible rationale for the journey was to explore the newly purchased territory, but Jefferson did not mention he wanted Lewis and Clark to go beyond the newly acquired territory for several reasons.

Walt Disney's visit to a Ford factory helped inspire the layout for Disneyland

Walt Disney visited Henry Ford's Greenfield Village and the Ford Motor Company's River Rouge manufacturing plant on a trip to the 1948 Chicago Railroad Fair. The layout of Greenfield Village inspired the different, distinctly themed sections of Disneyland in Anaheim, CA.

Mary Cassatt's mural from the 1893 World's Fair mysteriously disappeared

The massive mural was called "Modern Woman" and was displayed in the Woman's Building at the 1893 World's Columbian Exposition, better known as the Chicago World's Fair. When the fair closed in October of that year, the mural was put into storage, but it later went missing. It hasn't been located since. All that remains are black and white photos of it, like the one below.

See renderings of Frank Lloyd Wright’s unmade buildings

Only about half of Frank Lloyd Wright’s over 1,000 designs were actually built. In 2018, the Frank Lloyd Wright Foundation commissioned Spanish architect and 3D designer David Romero to make digital models to see what Wright’s unrealized structures would look like.

A 21-year-old college student designed the Vietnam Veterans Memorial

In 1981, a 21-year-old Yale architecture student, Maya Lin, won the national design competition for the Vietnam Veterans Memorial. The design was controversial for rejecting heroic statues, using a black wall, and avoiding overt patriotic symbolism.

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

Before the current East Wing ballroom project, only two White House renovations in the past 100 years cost more than $10M.

Trace how the Bill of Rights, inspired by centuries of political theory, took shape between 1774 and 1789.

Mid-century modern graphic designers, known for their bright colors and bold lines in advertising, also found success with children's books.

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.

Legendary architect Frank Lloyd Wright designed the SC Johnson headquarters in Wisconsin, aiming to make a cathedral-like workplace

Many legends about George Washington, including his supposed wooden teeth and the story of cutting down the cherry tree, lack evidence.

The Mona Lisa's celebrity status and repeated restorations have obscured what made the painting so revolutionary for its time

Walt Disney's early film 'Alice's Wonderland' was a groundbreaking innovation in the silent film era

Abraham Lincoln was almost assassinated weeks before his inauguration as he traveled from Illinois to DC through Baltimore in 1861; it took two independent claims for Lincoln to be convinced the threat was real

Visualize the path of every solar eclipse from 1900 to 2099 and see what each looks like when observed from different locations on Earth.

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

Watch this video that uses Lego bricks to explain how venture capital works.

When a Paris department store hesitated to sell Estée Lauder's perfume, she 'accidentally' broke a bottle, causing the smell to spread throughout the store and shoppers to start asking to buy the scent.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

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.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

The identity of the Tank Man in the iconic photo from the 1989 Tiananmen Square protests remains unknown and was possibly killed.

El Niño, Spanish for 'the boy,' was named after Jesus Christ because the phenomenon resembled the weather changes observed around Christmastime.

Use this tool to calculate the dollar value of your parental mental load, from meal planning to coordinating after-school care, then see resources that help generate solutions.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'

The US first hosted the World Cup in 1994, a tournament that lives in soccer infamy for its poor planning and the murder of Colombian player Andres Escobar, who'd accidentally scored on his own net.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Objects can be 3D printed with light by projecting 2D computerized tomography (CT) scans onto rotating cylinders of resin, which solidify upon exposure.