Hundreds of hidden passageways weave through the old quarters of Lyon.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

The world's most famous cheese caves.

Historic medieval fortified city in southwest France.

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

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.

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

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

A Spanish town built into the cliffs.

Moorish signal station on a stratgic rocky outcrop.

The final resting place of the great navigator, or maybe his brother.

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

Thousands of well-dressed mummies below a monastery.

Every inch of this chapel is covered in craftsmanship from across the world.

142 ceramic steps become a mosaic once a year.

Amöneburg is a town perched on top of a basalt mountain in the middle of an ancient meteor crater.