Visitors dip into a variety of pools of what was once ice.

The last bastion of Roman presence north of the Alps looms over a German town.

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

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

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

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

The Tudor-style cottage in the middle of the square is not quite what it seems.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A tongue-in-cheek arcade where the games are based on everyday life.

This pub has roots dating back to 1430 and serves as the setting for multiple Charles Dickens stories.

Death hangs in the air here, where a 17th-century gibbet has been erected on a Neolithic tomb.

Famously misunderstood wonder of the ancient world

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

A 13th-century fortified manor house that was once sieged during the English Civil War.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.