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

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

Secret refuge and museum of the Duke of Florence.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Venice's island of the dead.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

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

The oldest operating pharmacy in the world features 800-year-old recipes.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Pompeii's less famous neighbor is still revealing her secrets.

A Yiddish theater turned movie house turned rock and roll landmark turned gay disco turned bank.

A Natural History and Science Emporium.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

On the top floor of an upscale department store stands a lavish restaurant housed in a replica of a luxury French dining car.

The one-time office of the architectural firm that ushered in the Gilded Age is now a Club Monaco.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.