A spectacular cave and a beguiling lake.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

An antique cemetery in New York, this land is home to any number of famed corpses.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A haunted hill that supposedly defied gravity.

One of Japan's most famous sights, the bridge was originally built in 1673.

An exquisite tunnel of cascading flowers.

This abandoned-looking amusement park is frighteningly open for business.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A dangling church built over a Colombian gorge.