Ancient serpentine sacrifice holder that has stood the test of time.

A fountain standing as a testament to a doomed alliance.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

1513 Turkish world map, full of European state secrets and snarky commentary.

A memorial to the Vicentine who survived and documented Magellan's circumnavigation of the world.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Eat the ultimate iteration of Portugal's most beloved pastry.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

One man's remarkable private collection of art from around the world.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

These delicate sand pyramids look like naturally occurring gothic spires.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

A building so large that it has its own weather.

The highway's southernmost spot is a beloved local attraction.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

A monument celebrating the idea of reaching inaccessible places.

"We Seceded Where Others Failed."

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

A more chill but no less fascinating version of the famous ancient archeological site.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.