This plain church hides a thrilling interior. There are painted marble columns under a cupola, gilded chapels and fantastic 17th-century azulejos covering the surface. The unusual octagonal design was inspired by the Knights Templar chapel, which stood on a nearby site before this church was built in the mid-16th century. It was once the church of the Dominicans and is all that is left of the original monastery.
Unfortunately, the church is rarely open.