What a surprise I got when I saw this site. We headed here because Felix, the owner of the cottage Cantar do Grillo, spoke wonders of this place and offered to guide us. The place is awesome. Santo Domingos mines were opened by the Romans and later taken over by the English with the intention of finding gold and silver. They found copper but that was fine by them too. Eventually, they left, leaving behind a ghost town and an empty landscape. Because of the reddish tint of the water, the area is very similar to the Rio Tinto mines in Spain.