Giant, friendly pelicans in Central London, the most unlikely of places.

Metro station with a claim to rock n' roll fame.

Cold war icon and onetime "hole" in the iron curtain.

Floating swimming pool within a moored vessel.

Blitzkrieg bop your way through Berlin's Ramones Museum.

Where once there was a train station bathroom, there is now this German burger joint.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

An eerie, derelict amusement park in Berlin.

The first museum in the world devoted to sexual gadgetry.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Annual technopop celebration of peace and love.

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

This museum is dedicated to the little known ancient Roman history of Vienna.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

The Habsburgs' royal collections of art and wonders.

Apartment complexes built into huge repurposed natural gas tanks.

This cubist Vienna church building looks like some sort of alien stonehenge.

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

Cat art as far as the eye can see.

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