The village of Castromil is surrounded by a natural and agricultural atmosphere, and its medieval origins are still visible in its spatial organization, with narrow streets that meander through the village. Its well-cut granite buildings have rural architectural features; we highlight the 18th-century manor house with a chapel, which is the starting point of a Via Crucis that includes a number of cruises standing along the village.

The origin of Castromil is the word "castro" [hill fort], which refers to the existence of a fortified camp. Later, this place was deeply influenced by the Romans; we may find traces of their presence in the gold mines, also known as "Caves of Castromil", which include both open and underground mines.

Legend has it that these caves were inhabited by the Moors who were not welcomed by the people of Castromil. So, one night, the residents gathered a large herd of sheep and lambs, placed bells and candles on their horns and went around the village causing a lot of noise that, together with the lights of the candles, frightened the Moors, who quickly fled away and never came back, leaving all their belongings behind.