One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

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

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

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

Home to items never before seen by the public.

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

The United States Capitol's former columns still stand.

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

The national park was once a plantation estate.

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

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

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

The hidden offices underneath Memorial Bridge have been locked up since 1976.

The oldest stone house in Paris was built by its most famous alchemist.

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

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

An alchemist's "magic door" stands in the middle of a Roman park.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

A medieval house with mysterious alchemical inscriptions on its facade

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A 17th-century doorway in a small Sabine village is a portal into the mysteries of alchemy.

This storied music venue was once a tavern that housed an Italian Anarchist book club and prohibition parties; today it's a community space for artists and musicians.

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