The first museum in the world devoted to sexual gadgetry.

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

The hidden lair of an alchemist rediscovered in a 2002 flood.

Macabre astrological automaton clock dating to the late 1400s.

Countless grotesque faces stare out from this eerie Prague art wall.

A Jenga-style cylindrical tower of books that appears to go on forever.

Two stunning 17th-century libraries and a cabinet of curiosities.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Cat art as far as the eye can see.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

After a catastrophic forest fire, a Greek artist transformed scorched tree trunks outside an old sanatorium into this haunting sculpture garden.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

A beautiful bamboo trail tucked in this famous Japanese Shrine.

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

A standing relief of a Norman knight whose posture marks him as a Crusader.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

Huge standing stones mark a site of megalithic mystery.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

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

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.

On the Irish coast, 18 members of the Howard family are eternally resting in an Egyptian pyramid.

A teddy bear sits on a chair watching the sunset from the mountaintop—just as the late Dan Clancy had done since childhood.