Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

Walk through the history of American pop culture.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

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

A museum dedicated to exhibiting remarkable outsider art.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

The video game-themed street art first popped up in the French city.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

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

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

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

A cluttered and astounding collection of antiquities and curiosities.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.