I'm lucky enough to live down the street from Mission Basilica San Diego de Alcala. A truly special place, the mission was built founded in 1769 and currently serves as an active church and cultural center.
My daughter is studying California's Missions in school, so we took a small field trip the other day. No matter how many times I have been there, it is always a beautiful place to be. (The interior of the Mission is sacred, so I refrained from taking pictures of the altar inside.)