Visit the Castro of Chalcedon - Campo do Geres

The Castro of Chalcedon is diluted in a landscape intensively granite. But this was a fortified settlement at other times extraordinary importance, because in addition to its large size, was built in a place of difficult access, wrapped in labyrinthine tunnels, trying to confuse and disrupt the enemy.
Are known, even today, many remnants of this fort, covering the area of Chalcedon is still remains of walls and even some Roman construction ceramic fragment.