OH! San Diego presented by the San Diego Architectural Foundation celebrates the best of our city’s architecture by offering behind-the-scenes access to 75+ iconic sites. Each of the sites contributes in a unique way to the fabric of our city, with architectural, historic or cultural value. Select locations will offer guided tours and scheduled talks on a first-come, first served basis, while others will require reservations. The free architectural and urban design festival also includes a photography competition with prizes. The full list of sites and advance reservations will be available starting March 1.