The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Beneath the city of Lourdes, France is a massive, concrete church.

Historic medieval fortified city in southwest France.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

An alien landscape of chalk-rock in the Egyptian desert.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

A garden of flying flowers.

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

Scale model of St. Peter's Cathedral (Rome) in the middle of a small Dutch town.

This ghost town in Belgium will lose its street art when it ceases to exist.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

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.

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