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

This beautiful medieval Serbian monastery is home to frescoes, peculiar sculptures, and historical curiosities.

A rococo room covered entirely in porcelain originally constructed for another royal residence.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

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

According to the legend, this structure was built in a single night with the help of the devil.

A famed artist's inspiring work of peace and tolerance.

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

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

This statue is the only female representation of Rome's "talking statues."

The ruins of an early-18th-century complex that could once house up to 12,000 horses.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

The relics of dozens of martyrs are stored in a single chapel.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

This 13th century Gothic brick castle is the largest in the world by surface area.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

Numerous stone coffins from different centuries, lined up in a sixth century basilica.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

A place to see how French aristocrats lived in the early 1900s.

Featured in one of the most iconic scenes in cinema history.

When World War II came to Canada, Fort Péninsule was part of the first line of defense for Allied shipping convoys.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.