This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The pieces in this sculpture garden are made from demolished buildings that were once landmarks of Motor City.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

Opulent downtown movie theater now houses cars as an indoor parking garage.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

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

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

When it comes to handsignals (and colonialism) rock always beats scissors.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A historic ruin just 20 feet away from a busy highway onramp.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.

Outsider art meets paleontology at this roadside reptile repository.

Exact replica of the ancient monument, but much, much lighter.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

World's largest porcine hairball sits in a collection maintained by Benedictine monks.