One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

Geothermal waterfalls in Tuscany.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The middle finger of modernity.

Architectureal fantasy quarter of Rome.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The little tuxedo cat survived the trip, then languished in obscurity.

This fascinating museum in an old water tower holds the world's largest collection of Vodou artifacts from western and central Africa.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

There has been an astronomical clock on this spot since the 14th century.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

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

An unusual number plate signifies the building's saucy past.

Once the path of a railway tunnel, now home to thousands of glowing insects.

This demon atop the Notre-Dame de Paris looks utterly bored.

Got apples?

Weird wax anatomical models reside here, as do other anatomical specimens.

The largest medical and anatomical collection in France lies hidden from the public.

The celebrated eyesore created by starry-eyed sweethearts.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.