Photo by Cory Richards @coryrichards | Mustang, a former kingdom in north-central Nepal, is home to one of the world’s great archaeological mysteries. Hidden within the Himalaya on walls deeply cleaved by the Kali Gandaki River are an extraordinary number of human-built caves, also known as the «sky caves.» No one knows who dug them. Or why. Or even how people climbed into them. Pictured here is daily life against the backdrop of the caves. #followme @coryrichards for more #travel #culture and #mystery from around the world.