The narrowest street in Paris.

The site where two doves fell in love.

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

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

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

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

Ship skeletons haunt Baltimore's waterways.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

Notorious artist squat renovated into legal studios.

This massive library holds what was once the largest book collection in the world.

France's most famous cemetery, with some of its most curious tombs.

Medical history museum featuring a lovely doctor's office from the 1800s.

A hidden alley in urban Baltimore is a haven for graffiti artists.

The Home and murder site of the witch of Rehmeyers Hollow.

Its diverse collection of computers and technology spans the ages.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

This hidden garden boasts amazing views of Lyon.