This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

The eclectic observatory castle of a 19th-century astronomer and explorer.

The oldest operating roller coaster of its kind, the Montaña Suiza has been thrilling riders since 1928.

Get a close-up look at a 16th-century Basque whaling ship at this factory and museum.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

Hundreds of preserved dinosaur footprints can be found along a hiking trail in this small village.

A medieval village holds a very modern hotel.

A charming Spanish village sits atop this natural limestone overpass.

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

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

Giant topiary dog once played a role in a terrorist bomb plot.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

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

The world's largest reflecting pool is just two centimeters deep.

Wall after wall of this French seaside neighborhood is intricately decorated with seashells and corals.

Figures of unknown origin carved into the surfaces of underground caves.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

An aluminum skeleton brings Chinese mythology to the French shore.

A remote hilltop covered in giant monoliths haunts the Brittany countryside.

Europe's largest community of crocodiles and alligators.

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

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.