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

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

What looks like a suicide in progress is actually a statue of Sigmund Freud.

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

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

The remains of this 2nd-century Roman temple are incorporated into a modern building.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

2300-year-old Roman road connecting the empire.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

An alchemist's "magic door" stands in the middle of a Roman park.

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Once a speakeasy operated by Al Capone, this Milwaukee cigar bar is now a haven for ghost hunters.

Macabre astrological automaton clock dating to the late 1400s.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

These caves secretly held national treasures during World War II.