Visitors to El Castrello de San Juan de Paluezas can see the old stone foundations to these homes. Those that lived in this city were hunters and gatherers who often attacked the Roman outposts located in the lowlands. The people raised mostly sheep and goats, and Astrucon horses. They ate mostly acorn flour and raised barley, wheat and flax. A second similar site is the Castro de Borrenes, which the Astur built shortly before being invaded by the Romans. Visitors can see part of the city wall, which would have surrounded this city, although it probably was never finished as the Romans moved the people closer to the gold mines after they conquered them.
Las Medulas became more important during Roman occupation, when it was an important mining area. The Romans used opencast methods to remove 20,000 pounds of gold from the mountains each year. The gold was removed by 60,000 workers who would set fire against the rocks and then quench the fire with water. This would weaken the rock and water was then used to sweep away the debris, leaving the gold. To learn about this area, visitors should park at Médulas and visit the area of La Cuevona and La Encantada caves. Visitors will be able to understand the ruina montium network. At least seven aqueducts were dug under the mountain so that large amounts of water could flush the gold from under the mountains.
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