Tucked away below street level and concealed by a modern lobby is this evocative ancient spring, one of Braga's unexpected treasures. An essential community water source in the city's early days, the spring and its surrounding rock face were carved into a fountain during pre-Roman times by Celicus Fronto, an immigrant from the city-state of Arcobriga. One carving is of a toga-clad pilgrim thought to be holding the Horn of Plenty. An introductory video provides historical background.