The castro of Torroso Nature · Mos, Vigo, Pontevedra Image of Mos, not of the place itself. The Torroso hillfort, also called the castro do Retiro, was discovered by chance in the spring of 1983 in the municipality of Mos and was excavated between 1984 and 1990. Its period of occupation was very brief, from the beginning to the end of the 7th century BC, with no later reoccupations confirmed, which makes it one of the oldest hillforts detected in Galicia: it already shows a settlement from the initial stage of the castro culture built with an architectural system based on stone, a finding that requires qualifying the theories holding that this culture underwent a gradual process of petrification. It thus pushes back by several generations the known starting point of fortified settlements. Photo: Cunetas (CC BY-SA 3.0) What to see and do in Mos