If you want to get married in the White Marble City of Ashgabat, you should do it in this surreal disco ball building.

A memorial to the thousands of Turkmen soldiers and civilians who died in a bloody 1881 battle.

A fiery crater has been burning in the Karakum Desert since 1971.

Mysterious lost empire of the Silk Road.

One of the oldest and largest castles in the world.

One of the oldest monasteries in the world is a key pilgrimage site for both Muslims and Christians.

Ruins of the Crusaders' headquarters.

César Baldaccini's iconic sculpture of a 40-foot thumb stands tall in La Défense.

France's most famous cemetery, with some of its most curious tombs.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

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

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

A French artist's vague warning hangs over Belleville.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The first green space constructed on an elevated viaduct.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

This banal Parisian entranceway is not what it seems.

France's national museum of scientific and industrial instruments.

What looks like a normal building is really a hollow facade hiding a subway vent.

A unrivaled and rather horrifying collection of wax dermatological models.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Notorious artist squat renovated into legal studios.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.