Five candy-colored villages on the Italian Riviera.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

A French artist's vague warning hangs over Belleville.

This Parisian gem is one of the most incredible ethnographic museums in the world.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

A modern-day Lascaux cave underneath Paris.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

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

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

Egyptian Revival movie palace abandoned for decades and restored in 2013.

France's national museum of scientific and industrial instruments.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

Notorious artist squat renovated into legal studios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Abandoned railway line circling the city of Paris.

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

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

This old cement mine has been used as everything from a mushroom farm to a recording studio.