This natural sea arch highlights Ireland's rugged coastal beauty.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

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

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

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

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

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

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

A moody and picturesque riverside ruin overgrown with vegetation.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

Once the home of a hermetic monk, this cave now houses a small church.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

An existential riddle in the world's largest ancient castle.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

The first museum in the world devoted to sexual gadgetry.

Walk through Czech history in Prague's largest graveyard.

A Serbian church lit by chandeliers made of weapons.