An abandoned 6th-century monastery features a medieval map of the known world.

A nearly impregnable 16th-century fort is one of Goa's oldest.

For many years, the river that Julius Caesar led his army across into Italy was lost until re-identified.

A chunk of the "true cross" is held in this small Portuguese church where modern day exorcisms are said to be common place.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

An 11th-century medieval castle cascades over the town of Numão.

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

This former power station is now a museum dedicated to the region's coal-producing history.

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

An uninhabited village that preserves and documents rural architecture and an endangered way of life.

See replicas of Europe's most famous cave paintings and even some of the animals that feature in the art.

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

The building hides in plain sight in Ribadavia's historic Jewish quarter.

This small, lush island has a long and bloody history.

"Satisfying" is a good way to describe these beautifully aligned rows of Spanish mills.