A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

This basement museum explores the art and artistry of fascism.

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.

Cat art as far as the eye can see.

Museum preserving torture methods from the past.

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

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

A stately palace has been converted into the world's largest cannabis museum.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This cemetery features modernist statues as strange as its name.

A beautiful but toxic fountain of mercury.

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

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

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

A fascinating insight into daily life in the Eastern Bloc.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

Art and a pun, all in one.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

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

A surreal museum of extraordinary industrial objects.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.