Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

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

The largest whale museum in Europe allows visitors to walk among life-size giants.

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.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

A winding, blood-red tunnel of hardened lava navigable by foot.

The most powerful waterfall in all of Europe.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

This modern monument to pagan belief looks like it was transported straight from ancient times.

The Icelandic Sea Monster Museum explores the area's history of aquatic cryptid sightings.

The remains of an entire Roman city can be explored in this interactive museum.

Central Europe's largest collection of mini-bottles is on display at this museum devoted to a bitter Hungarian liquor.

This hidden art nouveau gem was designed by an architect in search of a national style.

Hungarian self-built castle.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

A miniature desert appears out of nowhere on the lush isle of Lemnos, like something out of a Greek myth.

A magical, if a bit tacky, 1960s castle conjures up medieval fairytales and Greek mythology.

This massive blockhead sculpture hides an entire library.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.