This massive underground salt mine now holds a sci-fi theme park in its depths.

An Orwellian sculpture with eyeball cameras watches passersby.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

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

A surreal statue honoring Prague's favorite literary son.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

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

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

This bar and museum are devoted to the controversial comic book work of Kája Saudek.

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This Stockholm light tower can be controlled by anyone with a smartphone.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

One of the best collections of wax anatomical models in the world.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The house that took a plunge into the facade of a museum.

The Habsburgs' royal collections of art and wonders.

Handsomely crafted representations of our round planet.

The beautiful baroque library of the Hapsburg empire.

The world's largest model of our planetary system.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

The final resting place for the remains of 143 Habsburg royalty.