The celebrated eyesore created by starry-eyed sweethearts.

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.

This mural painted by Keith Haring was done without payment as a gift to entertain the children at the Hôpital Necker.

A Parisian boutique devoted to la Sape, the elegant Congolese fashion subculture rooted in European colonization.

The personal library of the founder of modern neurology is open to visitors.

What looks like a normal building is really a hollow facade hiding a subway vent.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

Dedicated to the art of hunting, with juxtapositions of contemporary art.

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

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

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

A series of abstract, silly sculptures represent the works of a great modern classical composer.

This banal Parisian entranceway is not what it seems.

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

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

A modern-day Lascaux cave underneath Paris.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

A unrivaled and rather horrifying collection of wax dermatological models.

The first green space constructed on an elevated viaduct.

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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.