Garcia d'Ávila Tower House, also known as Castelo Garcia d'Ávila, is a fortified 16th-century structure built in 1551 atop Tatuapara Hill in Praia do Forte, Bahia, representing the first fortified building and only construction in the Americas with medieval characteristics. Commissioned by the first governor-general of Brazil, Tomé de Sousa, the tower house served as the first major Portuguese civil building in Brazil and a landmark of the country's colonization. The complex features the main tower house and Chapel of Our Lady of the Conception, reflecting Portuguese colonial architectural traditions, and functioned as an advanced sentinel post for Salvador with signal systems using smoke and torches to alert settlements of approaching enemy ships. Officially recognized as a National Historic Heritage site in 1938 by IPHAN, the property now operates as a historical and cultural park with an interactive museum, archaeological site, ceremonial spaces, and educational facilities.