A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

A medieval castle in the middle of rural Texas.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

A modernist landscape of water and sci-fi concrete.

A popular swimming hole that hides one of America's most deadly diving spots.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

A beautiful oddities shop crammed with strange and morbid curiosities.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

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

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

World's first "penitentiary," meant to be humane, drove men insane.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

Join the circus for a few lessons to learn clowning, acrobatics, and Chinese contortion.

This 19th-century church is now a popular roller rink.