A unique two-level bridge designed to honor a king.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

A musical instrument played by the sea.

This curious, round temple is the oldest still-standing marble building in Rome.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

A collection of objects supposedly singed by the hands of souls in purgatory.

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

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

A tree grown from astronaut seeds which were exposed to cosmic rays.

This little valley along Highway 1 is engulfed by thousands of lilies during the spring season.

For those going through a life transition, a place to leave behind a piece of your former self.

A clear blue swimming hole with hidden caves, still unexplored.

This antique shop specializes in the history of print and design.

Furniture tries to escape an abandoned building in San Francisco.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

Faceless white figures loom over the city from the rooftop.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.