This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

A Nesting Doll of Churches.

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 only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

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

Architectureal fantasy quarter of Rome.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

According to the legend, this structure was built in a single night with the help of the devil.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

This medieval city gate is now a blend of the past and the modern world.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

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

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

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

This stave church nestled in the Catskills was built in the 1960s by a community of Ukrainian immigrants and refugees.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

A miniature city within a city, complete with traffic signs, signals, and streets to teach Baltimore's youth traffic safety laws.

A hidden alley in urban Baltimore is a haven for graffiti artists.

This grove was planted more than a century ago by the War Mothers of World War I.

A small 19th-century graveyard tucked away in the middle of a suburban neighborhood.