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

Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.

This elegant arc of a waterfall marks a religious turning point.

The most powerful waterfall in all of Europe.

Staves, storm-calling, and of course, necropants.

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

Europe’s most powerful hot spring supplies the surrounding region with hot water.

Two whaling vessels that were sunk by an anti-whaling organization in 1986 now sit on the shore of this beautiful fjord.

This stone harbor was key to Carnlough's limestone industry.

Built in 1547, these ruins lie on a rocky promontory in Ballintoy jutting into the wild ocean waters below.

This garden has existed for more than three centuries.

These sculptures honor the knights who once called Carrickfergus Castle their stronghold.

This picturesque lighthouse at the edge of the Irish Sea looks like a giant stone pencil.

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

A museum dedicated to the tragedy of Bloody Sunday.

These murals stand as reminders to the troubled history of this Northern Ireland city.

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

Northern Ireland's Brobdingnagian stepping stones.

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

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