"In the Dark" Restaurant in Paris offers dinner in complete darkness.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The world's largest concentrated solar power plant.

An old airplane engine forms an unusual cairn atop this Moroccan peak.

Every half hour, the flow of this unusual spring cycles between a rush of water and barely a trickle.

Some of the smallest works of art in existence.

A medieval church built into an ancient cave.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

Among the best preserved megalithic monuments in the Aragón river valley.

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

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

Beneath the city of Lourdes, France is a massive, concrete church.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."