Five million people are laid to rest here, more than the population of Madrid itself.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

Ancient catacombs form the foundation for this Rococo orgy of a church.

Elaborate tile work in this railway station tells the story of Portugal.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

An old department store turned Nazi prison turned artist commune.

Vast stretch of tide-pools with a unique Moroccan charm.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A fake town founded by Western movie stars is now becoming a hip desert community.

The most visited, and possibly most controversial, museum in Germany.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

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

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