A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

Notorious artist squat renovated into legal studios.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A surrealist timepiece by the artist of melting clocks.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The celebrated eyesore created by starry-eyed sweethearts.

A rare view of a preserved Victorian science museum.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

In the early 1800s, surgery was also a show.

Arlington Cemetery exhibit dedicated to death and grieving.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Huge masonic hall in Philadelphia with lavishly themed rooms.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.