The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Walk in the footsteps of the gods and straddle two tectonic plates.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

A remarkably intact castle that once was the largest in Ireland.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

The ancient tomb acts as a calendar that keeps perfect time.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

A whimsical bridge adorned with decorative dragons.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Christ's blood preserved in a Belgian town.

Stocking up on the world's best beer requires a pilgrimage to a monastery drive-through.

This memorial museum chronicles the apocalyptic destruction of the First World War.

To enter this cluttered-yet-cozy sanctum of Belgian brews, ring the bell and tell the gatekeepers you've come “to taste beer.”

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.