The Cueva de la Sima is an old quarry of gypsum and building materials that was sometimes used by shepherds as a cattle corral. The place is a circular pit about fifteen metres deep, with a small shelter on one side, and should not be confused with the nearby Cueva de Pedro Fernández or Sima de las Yeseras, a gallery of several kilometres with remains from the Manchego Bronze Age that is closed to the public.