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

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

An overlooked memorial honoring the local Washington residents who died in World War I.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

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

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

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

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Perhaps the most scandalous statue of America's first president.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

The oldest continuously operating fish market in the United States.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

There’s a hidden military meme engraved on the World War II Memorial.

Largest Roman Catholic church in North America.

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

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

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A historic neighborhood church is reborn as a psychedelic arts collective.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.