@aggie.sanfrancisco: This San Francisco church has a 233 year old painting hidden behind its altar and almost nobody knows. Native artists painted it in 1791. It got sealed behind a wooden screen in 1796 and it's still back there right now. 📍 Mission Dolores, 3321 16th St, San Francisco, CA 94114 #MissionDolores #SanFrancisco #HiddenHistory #OhloneHistory #CaliforniaMissions