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

This short bridge is the only thing connecting a tiny Irish island to the mainland.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

One of Ireland's most infamous prisons for rebels including men, women and children.

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

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

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

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

A brisk climb up this solitary peak leads to the origin story of a towering figure in Irish history.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

The oldest public library in Ireland.

Sleep in a climate-controlled plastic bubble for the night.

"Drunken ship" sculpture memorializing the French poet in the city where he died.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This cemetery features modernist statues as strange as its name.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Turntable anonymously received orphans, alms, and groceries.