A stonemason's hilarious revenge came in the form of this peculiarly positioned gargoyle.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

A horse statue that receives constant makeovers from graffiti artists and locals.

A series of haunting wooden totems are hidden in the woods surrounding a German environmental center.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A 16th-century Andalusian palace.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This clifftop arch is a natural stunner.

A crumbling watchtower and a lighthouse overlooks the site believed to be the Sirens' cliff in the "Odyssey."

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

A massive marble foot is tucked away in a small alley near the Pantheon.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

An enigmatic modern marker left next to a historic Roman site.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

This ancient market is often referred to as the oldest shopping mall in the world.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A deep mark on the remains of a Roman temple, believed to be left by a legendary warrior.