In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

An original apothecary from 1792.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

This simple stone memorial remembers a secret, Geneva Convention-defying interrogation base from WWII.

This church is known as "The Home Church of George Washington and George Mason."

The former home of the man whose radical ideas changed the nation.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The site of the climactic scene from the classic horror film is now a historic landmark.

A derelict bit of transportation infrastructure hidden in the woods.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

A building shaped like the Army Corps of Engineers logo, because why not?

This forgotten boat elevator was an engineering marvel in its heyday.

The span is crooked and made from two older recycled bridges.

The oldest continuously-operating Chinese restaurant in the United States has been in business since 1911.