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

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

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

Below the altar in Saint-Willibrord Basilica rests the mortal remains of Luxembourg's patron saint.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

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

In the middle of a forest you can find the first landing place of an air balloon in the Netherlands.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

Luxembourg's first beer museum honors the Grand Duchy's contributions to the art and science of beer-production.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This Soviet statue is based on a piece of propaganda that's been elevated to national myth.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

The ancient latrines of the Greeks, in all their public glory.

1513 Turkish world map, full of European state secrets and snarky commentary.

This famous city eluded concrete detection until the early 2000's.

A marvel of Byzantine engineering under the streets of Istanbul.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Eighty million natural history specimens call this gargantuan museum home.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Largest tulip festival in America, includes fireworks, a parade, and a carnival.

Look closely and you’ll notice that the color changes a third of the way up the tower.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.