Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

The most visited, and possibly most controversial, museum in Germany.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

The San Marino-Rimini railroad was short-lived but this tunnel once provided shelter for hundreds of refugees during World War II.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

The wreck of a World War II cargo ship has become an unintentional time capsule at the bottom of the Red Sea.

The 20-mile causeway that separates the Netherlands from the sea.

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

The world's largest boar is a huge steel titan found at a French rest stop.

This historic stone gate tower is now just a lonely relic in the middle of a swamp.

A fortified palace in the shape of a ship on the Thiou river.

This French chateau is home to the world’s largest private collection of fighter jets.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

A suspended footbridge allows for traversing this gorge carved through the French Alps.

Fighting the British and making game shows for over 150 years.