An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The ghost town where the villagers refuse to leave.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

Miniature art that tells an enormous story.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Olfactory delights in San Francisco's Botanical Gardens.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

The largest medical and anatomical collection in France lies hidden from the public.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A haunting collection of the vanished and disappearing natural world.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

Dolls of all shapes and sizes display the eras of femininity in this spooky and beautiful collection.

Bouncing, delightful, mechanical art at the MIT Museum.

The sign at the garden gate reads: "These Plants Can Kill."

A rambling museum which honors the beauty in everyday objects.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.