Based in Cádiz, this quaint town is famous for its troglodyte dwellings built into rock overhangs above the Río Guadalporcún. According to the 2005 census, the city has a population of just 3,016.
The town extends along the course of the Rio Trejo with some houses being built into the rock walls of the gorge itself, created by enlarging natural caves or overhangs and adding an external wall.