Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

Da Vinci's equestrian statue, 500 years in the making.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

This building features dozens of faces along its facade, although one is a bit chilling.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Vibrant street art created with mixed media.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Week-long block party becomes a competition for the best decorated street.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The middle finger of modernity.

The legend associated with these ruins understates the splendor of the mansion that once stood here.