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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Rising from the sea like a stone monster.

Largest private bird collection in Iceland, formed from a tragic accident.

Medicinal spa created with the discharge from a geothermal energy plant.

An encyclopedic collection of mammal penises.

San Francisco Bay's ghost town.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

"Only the devil could play golf here."

Rippling sand dunes frozen in the Arizona rock.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

A small flooded ghost town with a few scattered structures remaining.

Mining town from the late 1890s, once home to Calamity Jane.

Traditional 15th century Chinese garden in the middle of Vancouver.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

Monsters and miniatures are held in equal esteem at this wondrous museum.

Highly spherical boulders on the shores of New Zealand.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

This strange geological landscape erupts with sudden bursts of water.