France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

This cheese shop also houses a museum devoted to Dutch dairy.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

An abandoned church gets a second life as a massive beer hall and event space.

Meet some of the most prominent figures in Black history through life-sized wax models.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

The U.S. Fish Commission’s effort to mass produce carp.

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.

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

A super-sized promotional trick that is now a D.C. landmark.

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

Parking garage where Bob Woodward met Watergate source "Deep Throat."

This unique historical monument features large concrete spheres designed to resemble fallen stars.

The United States Capitol's former columns still stand.

This stoic, if derpy, giant stands as a monument to Oregon's statehood and the novelty culture of yesteryear.

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

The magic's in the hole!