This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

This abandoned amusement park was built on a site with a dark history.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

The massive gardens and office of a Brazilian sculptor.

Kenyan restaurant is a carnivore's paradise, serving exotic meats at its ultimate 'Beast of a Feast.'

A British general, a suggestive tree, a map of paradise.

A spectacular cave and a beguiling lake.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

An isolated dive site teeming with cnidarians.

Old Danish castle immortalized in Shakespeare's Hamlet.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Ozymandias’ time-keeping temple.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

An enormous, inside-out glass globe built in 1935.

A bizarre house filled with an astounding array of collections.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

One of the deepest blue holes in the world.

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

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.