Castillo de San Juan de los Terreros was built between 1760 and 1764, during the reign of Charles III of Spain, as a horseshoe-shaped artillery fort for coastal defense. Its initial design by Thomas de Warluzel d'Hostel, was later modified, improved and finalized in 1764 by Antonio Duce Oliveros.
The first written record of church in Danmark locality date back to the year 1291. Close to the church are several stones with a Christian text and cross inscribed. The oldest parts of the present red-brick church are from the 1300s. In the late 1400s the church was enlarged to the appearance it has today. The church has been modified both internally and externally several times, among other things after the fires in 1699 and 1889. There are lot of well-preserved mural paintings in the walls.