Deadly airliner crash preserved for those willing to climb and pay respects.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

World's first "penitentiary," meant to be humane, drove men insane.

The world's tallest statue of an American hero.

Huge Russian Orthodox cemetery in danger of being converted into open public space.

Shop of curiosities with a dinosaur museum tucked in its basement.

One of the largest remaining ancient burial mounds of the 10th century.

This abandoned bunker looks out over the Atlantic from its clifftop perch.

Tribute to the famous Notre Dame football coach who died in a plane crash.

The prototype for all Nazi concentration camps.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

3D war panorama in Damascus built with help from North Korea.

A cannon designed to fire an atomic warhead.

This large cemetery is known as the museum of granite sculptures.

Described as "the world's most blinging pool."

Internationally-recognized arts center housed in a century-old former military barracks.

Most comprehensive museum in America devoted to one ethnic group.

The world's only known button museum.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

Largest Kauri tree in New Zealand.

Some of the clearest water anywhere in the world.

Cavernous opening completely encased in Karst limestone.

Kitschy steak joint where customers can cook their own meat over an eternal flame.

Built after the 1991 discovery of one of the world's most complete T.rex skeletons in the nearby hills.