This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

A 19th-century Baja cantina that many say is the birthplace of the margarita.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

A brutalist gem towering over the heart of Milan.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

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

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

100 year tradition of fist fights, marked by marble footsteps.

This ancient market is often referred to as the oldest shopping mall in the world.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

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

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

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

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.

Memorial to the father of the Republic of China.