This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Two stunning 17th-century libraries and a cabinet of curiosities.

Macabre astrological automaton clock dating to the late 1400s.

A Jenga-style cylindrical tower of books that appears to go on forever.

The first museum in the world devoted to sexual gadgetry.

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

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

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

This automated sculpture of two men peeing will spell out text messages with their micturition.

When you've got to go, you've got to go.

A Kyiv-based repository for all manners of discarded curiosities.

Copenhagen's celebrated theme park and gardens.

The garage at the childhood home of Steve Jobs was a hangout for the founders of Apple, even if they never built computers there.

A house built from trash known as the poor man's Hearst Castle.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A fascinating insight into daily life in the Eastern Bloc.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A monument to the man who almost killed Hitler.

A brush maker used his factory to protect blind Jews from the Gestapo.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

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

Resting place of Hollywood's immortals is also site of summer film screenings.