Castle of Buitrago del Lozoya is a 14th-15th-century Gothic-Mudéjar fortress built from brick and masonry within the medieval town walls near Madrid, distinguished by its nearly square plan and seven towers of varied shapes. The castle's towers feature distinctive rows of openings crowned by semicircular horseshoe arches, reflecting the architectural synthesis of Christian and Islamic building traditions. Once the residence of the Marquis of Santillana and his descendants, the fortress was designated a Cultural Heritage site in 1931. Though its interior remains in ruins, public visitation is available by appointment through the municipal government, which has stewarded the castle since 2000.
