THE most haunted places in San Antonio 😱 The Alamo The Alamo is said to be the most haunted spot in San Antonio, but what else can be expected from a historic landmark with a mass grave underneath? San Antonio's most iconic spot is said to still hold the spirits of the men violently killed while trying to defend the Alamo. More than 180 Texans died. Guests have reported hearing moans inside the building and even nearby hotels are said to have the spirits walking around and emerging from walls.