Devastated landscape used for hundreds of years by the Romans as their primary mining site.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

This enormous censer uses a pulley system installed over 400 years ago.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

Crumbling World War II-era gun emplacements still stand near lighthouses on the Spanish coast.

This enchanting natural park is a magical example of a temperate rainforest in Europe.

The remains of an encyclopedic sculpture garden later used as an internment camp.

This panoramic lift provides a futuristic ride up San Pedro Mountain.

The oldest Roman lighthouse still in use.

Giant granite sculptures representing family on the northern coast of Spain.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

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

Northern Ireland's Brobdingnagian stepping stones.

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

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

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

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

A museum dedicated to the tragedy of Bloody Sunday.

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

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

This ancient Irish tower could easily have stood in for Rapunzel's prison.