After 50 years of submerged at the bottom of a reservoir, a 5,000-year-old monument has reappeared in Spain. The megalithic site has 144 granite blocks, which are stand over six feet tall and are known as âSpanish Stonehenge.â Its similarity to the UNESCO World Heritage Site in Wiltshire is striking, but the Iberian version is made of smaller rocks. In the 1960s, it was thought to be condemned to the history books when a Spanish general ordered the construction of a hydroelectric dam in Peraleda de la Mata, near Cáceres in Extremadura.