Almost all the torrejones are in areas now uninhabited (except those in Castrejón and Alaejos, both of which were turned into castles, in later history). The torrejones were relatively simple square or egg-shaped structures, with several floors, built of limestone or brick. At least two categories of torrejones can be identified: The first have small peepholes in their walls and are built in regions that were in isolated areas at the time of use, and the other are small castles located in what were rural farming villages (though today they are deserted).