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

This beautifully situated lakeside Roman settlement was likely built during the reign of the Emperor Hadrian.

This 17th-century pub once had a hole in its wall so the neighboring blacksmith could easily access beer.

Everyone's favorite clay duo immortalized in bronze.

The town of Argleton has a postal code and appears on maps and even real estate listings, yet it does not exist.

The half-finished remains of what would have been Scotland’s biggest piece of landscape art.

The ruins of a medieval monastery named after a type of tree.

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

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

A stunning Victorian abbey and walled garden on a lakefront.

A museum dedicated to the tragedy of Bloody Sunday.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

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

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

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

These steps offer a breathtaking view of one of Europe's most besieged fortresses.