Uncover 300 years of history at the Alamo, an awe-inspiring story that’s more intriguing than you might imagine. Established in 1718 as Mission San Antonio de Valero, the former mission now known as the Alamo has been a crossroads of history. Having existed under five flags of independent nations and served as a garrison for five different armies, the Alamo has a rich history and a heritage to inspire. Best known as the site of the 1836 Battle of the Alamo, the rest of the 300 year history is vital to understanding why the Battle happened and its importance.