Los Angeles's oldest cemetery allows visitors to trace the history of this proud city.

Panorama exhibition hall in old silent theater with a beautiful backyard garden.

Small museum packed with artifacts recovered by the man rumored to be the real-life inspiration for Indiana Jones.

Gift shop offering toe tags and chalk body beach towels tucked into a coroner's office.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The restored and active Victorian-era final resting place of San Francisco.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

An invitation-only museum of items natural and bizarre, arcane and exotic.

A museum in the childhood house of a medical pioneer.

A fiery crater has been burning in the Karakum Desert since 1971.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Sloth rehabilitation center in the jungle of Costa Rica.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Towering basalt columns, a creation of fire and ice.

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

Hidden out of public view in the National Library of Israel is a collection of "Stalag's," 1960s Nazi themed porno paperbacks written and consumed by Israelis.

This small collection of rare books was uniquely locked up for safe keeping.

One of the oldest libraries in England, and one of the last of the great medieval chained collections.

Rare collection of medieval books under lock and key.

The beautiful baroque library of the Hapsburg empire.

One of Europe's oldest libraries.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.