Microscopic scenes; some call it novelty, some call it art.

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

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

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

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

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

The hidden lair of an alchemist rediscovered in a 2002 flood.

Macabre astrological automaton clock dating to the late 1400s.

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

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

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

Walk through Czech history in Prague's largest graveyard.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A floating cat sanctuary on an Amsterdam canal.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A sweet museum focused on beets.

This small university museum houses a priceless collection of scientific instruments.

The zoological collection at the Hessisches Landesmuseum hosts some of the world's oldest habitat dioramas.

This German museum devoted to the simple wonders of salt is actually built over an old saltworks.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

Nestled within a German forest is an intriguing, growing rock.

Small museum dedicated to one of the founding fathers of modern astronautics.