Over the last century, this elegant columned facade has been home to the headquarters of a bank, several nightclubs, and a restaurant.

This Masonic lodge was the first major private building to be constructed in Washington, D.C. after the Civil War.

An overlooked tribute to one of the most important peace deals in American history.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Sip creative cocktails in the former vault of the Riggs Bank.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

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

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

The house where John Wilkes Booth conspired with his co-conspirators.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

The Conduit Road Schoolhouse is one of the last one-room schoolhouses remaining in Washington, D.C.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

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

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

This grand gothic brewery has been pumping out suds for over a hundred years.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

People escaping slavery may have hidden inside a corpse vault.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.