The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

A line of blue paint marks the route of the inaugural parade.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The national park was once a plantation estate.

Go take a picture with the inventor of the daguerreotype photographic process.

Where the U.S. government kept its actual treasure, before Fort Knox.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A much-maligned monument to teetotalism.

It was once the base for a series of domestic terror attacks.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Washington's iconic carousel has a nice piece of Civil Rights history.