The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

One of downtown Berlin's last reminders of its Communist past.

The final resting place of the "father of special effects."

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

One of the oldest masonic museums in Paris.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

This museum houses an imposing skeleton army comprised of creatures great and small.

France's national museum of scientific and industrial instruments.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

Abandoned railway line circling the city of Paris.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

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

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

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Berlin's old airport.

Super-heavy Nazi architectural experiment.