Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

Longest canal tunnel in the world, abandoned in the 1960s.

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

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

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

One of the newest mosques in a city filled with thousands.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

A sixth-century Byzantine cistern hidden below a modern carpet store.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

The discovery of these rare, ancient artifacts led to the creation of a new museum.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

A 16th-century Andalusian palace.

The world's largest wooden structure.