Caparra is an archaeological site in the municipality of Guaynabo, Puerto Rico. It was declared a U.S. National Historic Landmark in 1994. The site contains the remains of the first Spanish capital of the island, settled in 1508 and abandoned in 1521. It represents the oldest known European settlements on United States territory. The site is on the grounds of the Museum of the Conquest and Colonization of Puerto Rico (Museo de la Conquista y Colonizaciòn), which features artifacts from the site and other archaeological sites in Puerto Rico.