One of the world's largest Tesla coils.

A mysterious drive-in nestled in the forest that leaves little to the imagination.

Eclectic final resting place of the controversial explorer.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

A petite castle folly in the English countryside.

The world's oldest model village.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

A man's home is his castle.

The world's first time capsule lies behind a welded steel door in Atlanta.

The beauty of urban decay, hiding some dark secrets.

Turning night into day in Victorian-era Austin to thwart a serial killer.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

An emerald-green grotto just a short trip from Austin.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

Decaying military base deactivated in the 70s is now visited by urban explorers and military enthusiasts.

Crumbling hotel echoes with the sounds of the '30s.

A town church once nearly submerged by the damming of a river is now hauntingly visible as the water recedes.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

The royal seat of Henri Christophe, a formerly enslaved man who became Haiti's only king.

These eclectic homes nestled into the cliffs of a Caribbean island were built entirely from scavenged materials.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

A city continually buried under the ash of a volcano that has been erupting for more than 15 years.

Bat house that has only ever housed bat for one night; they all flew away and never came back.

This "floating island" plateau sits 7,671 feet above the forest floor.