Famously misunderstood wonder of the ancient world

Northern Ireland's Brobdingnagian stepping stones.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The 40-foot-tall votive candle is the largest of its kind.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

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

Notorious artist squat renovated into legal studios.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

A passage grave used in neolithic rituals.

An abandoned beach resort in Normandy reclaimed by artists.