Where a guard killed nine German prisoners during one of the worst 20th-century POW camp massacres in U.S. history.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

This odd-shaped relic from the 1964 New York World's Fair found its way back home to Wisconsin.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

A museum in rural Utah documents the history of the Japanese Americans who were forcibly relocated there.

An ancient octagonal weather station named for the eight Greek gods of wind.

The art critic claiming that "only an ape could have done this" was in fact right.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

Plastic pups and their colorful homes greet travelers on this otherwise ordinary Australian street.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

Five million people are laid to rest here, more than the population of Madrid itself.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

This street has over a half-dozen names, all at once.

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

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

A monument to the two U.S. officers killed by North Korean troops while trying to trim a poplar tree.

The largest cemetery in the American Southeast is a hidden gem near the heart of Atlanta.

This ever-changing arrangement of naked dolls even caught the attention of "The Walking Dead" crew.

It's possible to walk inside one of the largest Neolithic tombs in Britain.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

A preserved oasis with traditional Andalusian-style architecture and beautiful views of the Nile.