Look around you at the towering stone tenements. In the seventeenth century, Edinburgh was a walled city with a rapidly growing population that had nowhere to go but up. This led to the creation of the world’s first skyscrapers, with some buildings reaching an incredible 14 stories in height. Between these tall buildings, you will see narrow, winding alleyways known as closes and wynds. These were the vital arteries of daily life where thousands of residents, from wealthy merchants to the working poor, lived side by side. One of the most famous is Mary King’s Close, named after a prominent seventeenth-century textile merchant; it was later partially demolished and built over to create the foundations of the Royal Exchange, essentially freezing a segment of the ancient city underground.