The hollow trunk of this 650-year-old tree was used as a hideout by two Jewish brothers during World War II.

This ancient fortress in Iran was once the oldest and largest treasury in the world.

A water tower shaped like a giant coffee pot looms over a small Swedish village in Central California.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

One man's quest to save his town with a trail of record-breaking sculptures.

There's something big lurking beneath the surface of this tiny Oregon park.

This massive roadside mascot was the first version of the giant to illustrate his butt.

Ever wanted to can Spam?

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

This pyramid in southern Sweden houses the remains of an eccentric nobleman, who spent his life doing whatever he felt like doing.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

An acoustic anomaly with a mysterious cause.

Need to book a room at the Hotel Pennsylvania? Just dial up 6-5000.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Started nearly 100 years ago, this science experiment just keeps on going, ever so slowly.

This abandoned oil depot produces world's longest echo in a manmade structure.

Wheels of chrome by the thousands adorn this California Historical Landmark.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

The southernmost outpost of the Russian Empire in colonial America.

A clerical error gave rise to this imaginary micronation in the southwestern corner of Estonia.

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.

A hidden three-foot-wide house separates these two regal churches.