Misión Nuestra Señora de la Purísima Concepción de Acuña, known as Mission Concepción, was established in 1716 by Franciscan Friars in East Texas and moved to San Antonio in 1731. Its stone church, which was completed in 1755 and has never fallen into ruin, is considered by some historians to be the oldest unrestored church in the United States. Mission Concepcion consists of a sanctuary, nave, convento, and granary. When originally built, brightly painted frescos decorated both the exterior and interior of the building. Traces of the frescoes still exist on the weathered facade of the building. On October 28, 1835, Mexican troops under Colonel Domingo Ugartechea and Texian insurgents led by James Bowie and James Fannin fought the Battle of Concepción here. Historian J.R. Edmondson describes the 30-minute engagement as “the first major engagement of the Texas Revolution. San Antonio Missions National Historical Park is a National Historical Park and part of a UNESCO World Heritage Site preserving four of the five Spanish frontier missions in San Antonio, Texas, USA. These outposts were established by Catholic religious orders to spread Christianity among the local natives. These missions formed part of a colonization system that stretched across the Spanish Southwest in the 17th, 18th, and 19th centuries. In 2015, the San Antonio Missions National Historical Park, along with the Alamo Mission in San Antonio, was designated a UNESCO World Heritage site. San Antonio: Mission Concepcion by wallyg is licensed under CC BY-NC-ND 2.0