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

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

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.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This small Roman arch was transformed into a dwelling by the founder of the Trinitarian Order.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A Nesting Doll of Churches.

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

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

This little train station is forever immortalized in film history.

This historic electric train has operated with regularity since the early 1900s.

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.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

The world's smallest drawbridge.

In Bermuda, this formal naval residence has become a go-to for cliff-jumpers and hikers.

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.