Mission Concepción (Nuestra Señora de la Purísima Concepción de Acuña)

Completed in 1755, Mission Concepción is widely cited as the oldest unrestored stone church in the continental United States. It remains an active Catholic worship site and regularly holds Mass and religious observances. The mission is part of San Antonio Missions National Historical Park and was included in the 2015 UNESCO World Heritage designation for the San Antonio Missions.