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

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

This single room has survived the centuries with almost no deterioration.

Go surfing on this urban wave, "hacked" by local surfers.

The stately remains of Llywelyn the Great's mighty fortress.

Seaside ruins of a settlement that date back to the first century B.C.

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

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The most loyal of little dogs, or a Victorian era publicity stunt?

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

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

A Spanish town built into the cliffs.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

An Austrian house of bones filled with hundreds of intricately painted skulls.

An ancient Egyptian temple in the middle of Madrid, Spain.