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

The most visited, and possibly most controversial, museum in Germany.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Where the lovelorn find a home for their sentimental keepsakes.

The site of Austria's biggest concentration camp now honors its victims.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

The shell of a medieval fortress offers commanding views of the area it once protected.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Double spiral staircases are not unheard of, but they are very rare.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The drama of nature in full effect in this Nevada State Park.

More than a century old, this trading post resides in the Navajo Nation.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

A fake town founded by Western movie stars is now becoming a hip desert community.

Quite simply the largest tree in the world (by volume).

A B-17 bomber stands as a memorial to the residents of Tulare County who served in World War II.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.