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

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

Right up until the 20th century this network of man-made caves was the biggest village in Eastern Armenia.

This abandoned prison was so notorious that its name has become a metaphor throughout Albania.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

This small shrine is dedicated to the designer of the first Russian fighter jet and his brother, who became Chairman of the Presidium of the Supreme Soviet.

Armenia's premier center of astrophysical research was established during the Soviet era.

The ruins of a medieval monastery built on a perilous slope.

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

Giant stone letters dedicated to the founder of Armenia's alphabet.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

Dedicated to the history and culture of smoking, this small museum now includes a vape lounge.

A museum which takes visitors to the côté obscure of Paris.

The Sun King's military models, saved from the Louvre.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

A subterranean shelter remains intact under a busy Paris railway station.

Crammed inside this grounded passenger plane is a bar that was once a Communist hang out and is now a ratty relic.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

This almost a century old piece of architecture had been overlooked by most, except for the drunk and the homeless

A small monument on the outskirts of Prague, where one of the bloodiest conflicts in the country's history was decided.