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

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

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

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

This Neolithic passage tomb forms part of a World Heritage Site.

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

A trail of "Game of Thrones"-themed doors carved from fallen trees from the iconic Dark Hedges.

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

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

A retired military stronghold on the rolling green coast of Donegal.

This rare and ancient Christian relic is one of Ireland’s oldest freestanding stone crosses.

This World War II relic let Allied pilots know they were entering neutral airspace.

The ancient tomb acts as a calendar that keeps perfect time.