The first skyscraper to include a Ferris wheel built into the facade.

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

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

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

A curious cave church carved into the face of a cliff.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Baroque celebration of the end of the Great Plague of Vienna.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

A unique museum dedicated to culture and artistry of carpet weaving.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

A massive collection of petroglyphs dating back some 40,000 years.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

Fortified homes of highland warriors that are still in use today.