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

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

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

The decaying remains of a once-luxurious Soviet spa town.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

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

Ancient rock-hewn town that witnessed key events of Georgian history.

Underground monastery and fortress.

A modern tower, symbolizing the legend of a golden egg on top of the tree of life.

An entertainment center in a huge transparent tent.

Iconic pyramid from famed British architect Norman Foster designed to represent all of the world's religious faiths.

Lonely minaret stump of a destroyed city.

A stunning blue-green lake located in the Terskey Alatau mountain range.

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

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

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

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

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

The silly symbol for an underground protest group is now scattered around the city.

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

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

Housed in a 1912 architectural masterpiece, this outlet of the Golden Arches is a real beauty.

This dazzling Art Nouveau mansion is now home to the Modern Art Gallery Subotica.

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.