The geoglyph once sported a glass bottle eye.

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.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

The English town of Mansfield likely got its name from this enigmatic breast-shaped mound rising abruptly from the earth.

A close look reveals that the Scottish monument is just slightly off-kilter.

This medieval manor house was hastily fortified when it found itself in the middle of the Scottish fight for independence.

A slightly surreal menagerie of structures that were lovingly spared from demolition and reconstructed in a field.

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

This beautiful, historic church looks like something out of a simpler past.

A strange and ancient landscape hides the dark, cavernous remains of a 5,000-year-old flint mine.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

Three columns of volcanic rock shoot out of the ocean.

The modern birthplace of Irish freedom.

A small village in two different countries.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

This 600-year-old home seems to defy physics.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

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

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

The stately remains of Llywelyn the Great's mighty fortress.