This multi-level, aqueduct-footbridge hybrid is one of the greatest works of the Spanish Renaissance.

These magnificently sculpted tombs represent Spain's own legendary version of "Romeo and Juliet."

The Avenue of Mausolea is a series of grand palatial tombs.

Controversially restored in the 1970s, this giant 15th-century mosque is shrouded in legend.

Home to what was once considered the largest gate in central Asia.

A beautiful modern church dedicated to the teleporting patron saint of Andorra.

The ruins of a bombed medieval village memorialize the destruction of the Spanish Civil War.

Built between 1901 and 1908, this building is one of the most iconic examples of modernist architecture in Spain.

This cavernous swimming spot doubles as a home to the largest known colony of bats in Central Asia.

Where Stoddart and Connolly suffered in the infamous Bug Pit.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

The ruins of an ancient Zoroastrian Tower of Silence believed to be the earliest example of the traditional funerary practice.

These "50 Fortresses" have been unearthed in the ancient oasis of Khwarezm.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Once a bustling fishing port, this semi-ghost town is now more than 90 miles away from the shore.

Prowl through this sprawling bazaar under a massive Soviet-era dome for delicious eats.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

An art installation that will challenge your understanding of reality and perception.

These beautiful historic watchtowers were used for both scanning the desert for enemy invaders and observing the celestial world.

A staggering number of rock carvings in an abandoned quarry.

Once a luxurious flagship of the Soviet Union, this Brutalist structure remains a landmark of Tashkent’s communist past.

This 23-foot-tall bear stands amid the hustle and bustle of Hamad International Airport.

This fountain pays homage to Qatar's history of pearling, the primary industry before oil.

Qatar's oldest market can trace its origins back more than a century.