Suburban observatory was personal lab of the father of modern astrophysics.

The only museum and archive west of the Mississippi that is dedicated to the study of Abraham Lincoln.

Gorgeous purple flowers drape from the world's largest blossoming plant.

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

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

This beautiful 150-year-old synagogue survived Italy's fascist period and the Second World War.

Italy's only urban waterfall has enchanted artists and travelers for centuries.

This museum located in Fondi is also said to be the most haunted building in town.

Plaques on its facade commemorate the Tiber's most destructive deluges.

Claude Monet immortalized this medieval bridge in two of his paintings.

A small island in Lake Garda that was used as a burial site, pirate hideout, and a monastery.

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

A rare example of a medieval house in Rome adorned with a melancholic inscription.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

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

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

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

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

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

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

A beautifully well-preserved ancient Roman villa.