It's said this geological anomaly was caused when the Devil took a bite out of the Irish mountainside.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

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

The oldest hall in Iceland was written of in the Sagas and features a centuries-old escape tunnel.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

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

This Dutch statue is a monument to the fictional shrew who brought doom to the city of Stavoren.

Home to the world's oldest functioning orrery.

This weekly bazaar started in the 1960s as a way for hippie travelers to barter their goods.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The most powerful waterfall in all of Europe.

This elegant arc of a waterfall marks a religious turning point.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

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

Staves, storm-calling, and of course, necropants.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Breathtaking Byzantine paintings cover the inside of this 12th-century church.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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.