Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

For centuries, this town's hot springs have been embraced by rich and poor—and even by Popes.

This war memorial commemorates some of the world's first paratroopers.

The leathery remains of a woman who died in the 13th century now lie in a church named for her.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

A living time capsule of the 1960s Richardson Bay water-front.

Oddly shaped rock formation, misassociated with a nearby utopian community.

In the "Danish Capital of America," a replica of one of Copenhagen's most iconic buildings.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

Golden Gate Park's historic collection of plants.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

Inside this museum, the history of the Walt Disney Family empire is on full display.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

This Native American settlement dates back to the Pueblo II period.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This balancing rock is one of Utah's most unusual geological formations.

The location where the iconic movie character declared it was time to go home.