A French museum of wrought iron.

An ancient ossuary in Rouen.

Continuing the tradition of the dime museum in style.

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

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

Visitors dip into a variety of pools of what was once ice.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

Romania's only crater lake with water as pure as if distilled.

Museum about life, death, and cannibalism in the Stone Age.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Stunning wetlands ablaze with pink lotus flowers.

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

The glowing blue Nymphaeum of Emperor Tiberius.

The largest of London's subterranean rivers and once a mad, bad center of London life.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An ethereal glowing blue ocean cave in Croatia.

A spectacular cave and a beguiling lake.

Walk through a fairytale in Tuscany.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

Traveling collection of amazing automata.

A curious collection of mechanical moving figures.

A small town hallucinates en masse - Bad bread, or CIA science project?

The largest and most famous wax anatomical collection anywhere in the world.