Castillo de Don Mario is a distinctive modernist structure located on a hilltop in Archena, Murcia, originally constructed as an elaborate dovecote belonging to the wealthy Fontes family. Named after Dr. Mario Spreáfico, a beloved local physician born in Algeria in 1883, the building features a fortress-like appearance with historicist architectural references, notably a prism design with cylindrical towers at its corners. The castle's striking silhouette makes it a memorable landmark for visitors entering Archena from the national highway connecting to Murcia and Madrid. Though the building is not open to the public and is now privately owned with interiors adapted for office use, the Castillo de Don Mario remains one of Archena's most characteristic symbols of local identity.