This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

This drive-by, rotating mini-gallery is nestled in the suburbs of Colorado.

Only a few signs remain of the buried Colorado mining town that supplied the uranium for the first atomic bomb.

Inside this shop, visitors are treated to a unique blend of natural history and art.

A beautiful combination of living flora with preserved bones covers the shelves of this shop.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

The glowing blue Nymphaeum of Emperor Tiberius.

Venice's "Island of the Mad."

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Geothermal waterfalls in Tuscany.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Renaissance villa and gardens complete with a tormented colossus.

A submerged archeological park still holds the wonders of a Roman Sodom.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A 16th-century horror show built in a lovely Italian garden.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A floating cat sanctuary on an Amsterdam canal.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

A 2,000-ton rock resting in a state of a delicate balance.