The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

Made famous by "Star Wars," these troglodyte homes face an uncertain future.

The most powerful laboratory radiation source in the world pulses with 1,000 times the electricity of a lightning bolt.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

World War II ended before these tunnels built to protect vital oil from Japanese bombs were ever used.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

A hidden workshop for creating and restoring Papal mosaic masterpieces.

The world’s largest collection of Tiffany glass sits in a warehouse in Queens.

England’s ancient oak tree has such an impressive girth, people have been hosting parties within the hollow trunk for centuries.

This is probably not the Target you're looking for.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

Yup, that's a 330-foot yacht passing over the highway.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

Gnomes have their very own bonsai-landscaped settlement on a university campus.

A half-size replica of the World Trade Center towers above Tulsa.

A New Zealand rubbish dump named after British comedian John Cleese.

The oldest living cultivated fruit tree in North America.

Suffocating dogs was a common spectacle in the fumes of this noxious cave.