The United States Capitol's former columns still stand.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

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

A historic arena where the Beatles played their first concert in the U.S.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

The oldest still-operating tavern in the United States was once owned by a pirate.

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

The oldest continuously operating fish market in the United States.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

There’s a special club house at the top for the bell ringers.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

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

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

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

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

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

Decades before the scandal, this staircase on the river was a literal "water gate."

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The most accurate timepiece in the world.

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