Fou of Montaner Curiosity · Vallirana, Baix Llobregat, Barcelona Image of Vallirana, not of the place itself. Karstic cave in the municipality of Vallirana, within the rich system of caves and potholes of the Garraf massif. Together with the Penya, it contains Neolithic remains dated between 4100 and 3600 BC, which place here a human occupation from the region's recent prehistory. Photo: Pere López Brosa (CC BY-SA 4.0) What to see and do in Vallirana