These "50 Fortresses" have been unearthed in the ancient oasis of Khwarezm.

Former island in the Aral Sea used to be a top-secret Russian bio-weapons facility.

Avenue of trees planted by cosmonauts before their space departures.

Rusting ships sit in a desert where a sea used to be.

A Stalinist prison camp for the wives and children of men accused of betraying the Soviet state is now a memorial museum.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

This abandoned stepwell is one of the largest, deepest, and certainly one of the creepiest in India.

An unassuming tomb houses an important milestone in Indian architectural history.

Visit a haunted Mughal mosque and the tomb of a Sufi saint and his disciple.

Nestled among the artifacts of the National Crafts Museum, this hidden gem offers hard-to-find regional foods from all over India.

A startling, centuries-old subterranean marvel hides in plain sight.

A commemoration of the little-known cultural influence that Tolstoy had on India.

A favorite haunt of Delhi's politicos and intellectuals, this old-school coffee shop was shut down under Indira Gandhi's Emergency.

Made by a man on a worldwide sanitation crusade.

Buddhist monk remarkably preserved because he started the mummification process while still living.

Pennsylvanian mass grave and possibly mass murder.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

A rare view of a preserved Victorian science museum.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

A former plant in one of the hubs of U.S. steelmaking has been turned into this museum celebrating the history of American industry.

The oldest philatelic museum in the United States.

A cave dug by a man directed by ghosts to find pirate treasure.