The walls of Mansilla de las Mulas, the greatest example of medieval fortification in the province of León date back to the 12th century, the period, in which Fernando II repopulated the town. Every forty metres there were watchtowers that connected the walls, now disappeared. Remains of the fortification include large fragments of the wall and several battlement towers.
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.