This angular brutalist playground turns playtime into modern art time.

Model Trains and Much More in Hamburg.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Former headquarters of the KGB.

Nestled in a peaceful valley, this Armenian monastery may have been saved from Mongols thanks to the eyes of God.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

This series of Armenian caves held the oldest brain, shoe, and winery in the world.

A geological oddity topped with a 2,000-year-old pagan temple.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Underground monastery and fortress.

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

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

Unusual building appears to be haphazardly built from randomly piled bricks.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

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

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

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A three-centuries-old crypt in the foothills of an old plantation.

A shrine of fire worship built on top of a natural flame.

Mysterious hillside with a continuously burning natural fire.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

Hiding amid the largest camellia collection in the country lies a charming children's maze, donated by a secret admirer.