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

A grumpy old water goblin guarding an old mill on the Devil’s Stream in Prague.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

A surreal statue honoring Prague's favorite literary son.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

A mocking tribute to the past and modern leadership of Prague.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

A series of playful yellow penguins share a serious message about the environment.

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

A quasi-futuristic roof sits atop a medieval Bohemian monastery damaged during World War II.

Dictionary Johnson’s favorite feline.

The taxidermied remains of a once-great parrot.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Ship-sized kinetic sculptural fantasy.

An architectural oddity hides in plain sight on this iconic London bridge.

Rebuilt remains of a temple to Roman god Mithras.

Murals of the wild parties once held on the frozen River Thames.

An incarceration museum on the spot of possibly the oldest prison in England.

This one has sailed five times as far as Sir Francis Drake's famous ship.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.