A once grand hotel is being retaken by the wilderness it once capitalized on.

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

A beautiful geyser under environmental threat.

Become a prohibition rebel.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Explore 10 acres of environmental sculptures.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

The world's brightest bioluminescent bay.

An abandoned saucer-shaped monument in the Bulgarian mountains.

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

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A picture-perfect town, perfect for blowing up.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Rising from the sea like a stone monster.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

Famously misunderstood wonder of the ancient world

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

The first declared National Monument in the United States.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This lab's maddening silence is good for business but bad for sanity.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.