One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

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

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

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

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

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

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

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

One of Ireland's best-preserved chambered cairns can be found next to a wishing tree.

The wreck of a B-29 Superfortress now stands as a memorial left in the moors.

The remains of a concrete ship sit on a sandbank between Ballina Quay and Belleek Woods.

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

Modern sundial uses ancient methods to tell time and date perfectly.

Huge standing stones mark a site of megalithic mystery.

This natural sea arch highlights Ireland's rugged coastal beauty.

The largest stone circle in Ireland.

The world's only flying boat museum honors a small Irish village that sent 20th-century aviation to new heights.

An abandoned faux-pub made famous by a Guinness commercial.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

A historic steam train meanders along one of the most scenic rail routes in Germany's Black Forest.

Enter the cabin of a life-sized Hindenburg replica.