Due south of San Agustín stands this fully functioning convent and monastery, founded in 1592. To this day, entering nuns (who remain cloistered for five years) have only one hour each day to talk to each other or watch TV. But they make all sorts of natural products (shampoos, wine, hand cream, elixirs and more), which you can purchase from a rotating door that keeps the nuns hidden.
A free tour (in Spanish) of the monastery’s museum takes in 18th-century religious paintings, some of which are downright gruesome.