Rare recess caves fill this unbelievably beautiful Ohio park.

The largest earthwork effigy in the world.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

An inconspicuous footbridge beloved by San Diego locals.

These mystical miniature houses bring a touch of magic to the New Jersey woods.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

A storefront museum in Asbury Park honoring the Jersey Shore’s deep history of mystery—including the Jersey Devil.

A unique sculpture park that specializes in the huge and bizarre.

The abandoned coal loading dock is a canvas for unsanctioned art.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

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

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

Where America's first doomsday cult awaited the end of the world.

A tunnel with windows, so you don't miss out on the impressive views.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

An eerie, decaying ghost town destined to fade into the forest.