This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

What looks like a link in Gondor's early warning system is actually a centuries-old Italian fortress.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

A moving memorial to the fallen and missing from WWI trenches.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

Descend into the tunnels to experience the life of a coal miner.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

Brussels' favorite peeing boy has a sister.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

A rare example of World War I trenches from the British front.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

A little sculpture with a large wardrobe.

Theme park featuring miniature replicas of European monuments.

Climb inside an iron crystal magnified 165 billion times its normal size.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

What was once a bustling mining installation is now a bustling hub of contemporary art.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.