This grand hydraulic installation has provided water for townspeople since the Middle Ages.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Founded in 670, this ancient mosque is an architectural time portal.

This elaborate temple was built around one of the Buddha's teeth.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Mountain where Jesus was first tempted by the Devil.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A fountain standing as a testament to a doomed alliance.

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

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

Where the lovelorn find a home for their sentimental keepsakes.

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

You'll find just about anything in this funky Tbilisi flea market.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

A museum glorifying the life of Stalin, located in the city of his birth.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

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

Small church on top of a huge rock column.

These Stalin-era industrial 'death traps' hang lifeless above the city

The charmingly disheveled clock tower of Tbilisi's puppet theater.