Inside a former smuggler's cave, an artificial waterfall and light show.

This grandiose staircase was part of the revival of a medieval Spanish architectural style combining Christian and Islamic influences.

Europe's largest river aquarium features freshwater species from around the world.

The geomorphology of the Turia Valley could easily be mistaken for Utah or Arizona.

Once a spa resort, then a tuberculosis sanatorium, and now a crumbling ruin.

The engineer of the Imperial Canal of Aragon installed this fountain to show skeptics he had achieved his aim.

A private collector gathered these sound machines and musical instruments across five continents.

From motorcycles to firetrucks and sports cars to horse-drawn carriages, this Belgian collection goes beyond rare cars.

These structures hanging over the water's surface are traditional fishing machines.

A bridge to rival those in nearby Venice but without the crowds.

This historic Art Nouveau townhouse was the former home of the son of a famous chemical inventor and industrialist.

This former drainage pumping station was fundamental to the drainage of the Po delta.

Depending on how it is measured, this lighthouse can claim to be the tallest in Europe and the tallest conventional lighthouse in the world.

This impressive mural is just one amazing artwork on the walls of a data center in Padua.

A place steeped in history that may be best known as the set of a 1960 film.

This Gothic revival structure has been a family home, a military base, a gymnastics center, and is now owned by one of the largest auction houses in Italy.

A historic and beautiful Art Nouveau chamber in a historic railway station.

This fiberglass version of the Awakening sculpture by Seward Johnson, now resides in its third location in Italy, in Viterbo.

This local cultural center is housed in one of the most important Valencian Art Nouveau buildings in a town that is blessed with many.

Marvel at this immense work of art that greets arrivals to the city.

These 7,000-year-old cave paintings depict life in Neolithic Spain.

This historic line is a remnant of an ambitious and unconventional project that today provides panoramic views of the Ligurian mountains.

This set of Berber granary caves is now an interpretation center for the cave window structures in the Clarino valley.

Hike along an abandoned railway up to a popular pilgrimage site.