The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

A surreal statue honoring Prague's favorite literary son.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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.

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

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

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

Macabre astrological automaton clock dating to the late 1400s.

The first museum in the world devoted to sexual gadgetry.

A reproduction of earth's many biomes.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

See massive fossils that are over 200 million years old in northeastern Arizona.

An incredible airplane graveyard sits outside this small museum dedicated to preserving aviation history.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

This 24-acre park offers a place for meditation in the midst of Sedona's iconic red rocks.