Yacimiento de El Castelo Curiosity · San Silvestre de Guzmán, Costa Occidental, Huelva Image of San Silvestre de Guzmán, not of the place itself. Fortified settlement on a hill on the left bank of the Guadiana, near the Fuentesanta farmhouses, with occupation documented from late Prehistory to the Iron Age. Its remains, about 5,000 years old, are the oldest evidence of human presence in the municipality. Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in San Silvestre de Guzmán