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Cat art as far as the eye can see.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Museum preserving torture methods from the past.

A curious collection dedicated to human and animal anatomy and pathology.

An eerie, derelict amusement park in Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Started as a kitchen garden, now the second largest botanical garden in the world.

The most visited, and possibly most controversial, museum in Germany.

A surreal museum of extraordinary industrial objects.

A wunderkammer of mysterious objects and stories.

A fascinating insight into daily life in the Eastern Bloc.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

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

The world's only museum devoted to the wonders of fluorescence.

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

A floating cat sanctuary on an Amsterdam canal.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The history and future of cannabis.

A beautifully eclectic mix of architectural styles.

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

This old mill has been converted to a cave-like fantasy world by one eccentric artist.

Walk through Czech history in Prague's largest graveyard.

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

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

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

The beautiful baroque library of the Hapsburg empire.

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

Macabre museum devoted to historical Viennese murders.

This former insane asylum now holds a pathological anatomy museum.

Handsomely crafted representations of our round planet.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A Milanese café entirely designed by the American director Wes Anderson.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Some of the smallest works of art in existence.

Extensive Orthodox icon collection in Andorra.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.