Constructed during the early 18th-century during the reign of Sultan Ismail bin Sharif, the Kara Prison (or Habs Qara) is a vast subterranean prison in the city of Meknes, Morocco. Its most unusual feature is that it lacked doors and bars, but it’s believed that no one ever escaped. Its inescapability despite lacking bars and doors was due to its complex labyrinth-like design. It was named after a Portuguese prisoner who was granted freedom on the condition that he constructed a prison that could house more than 40,000 inmates. The…