La ventana de Rosa, The Rose Window, is located on the south wall of the church sacristy. The window is described as the site where the Host was shown to gathered Mission celebrants during the Feast of Pentecost.
Sculpted in 1775, the Rose Window is considered to be one of the finest examples of baroque architecture in North America. Its sculptor and significance continue to be a mystery. Folklore credits Pedro Huizar, a carpenter and surveyor from Spain, with carving the famous window as a monument to his sweetheart, Rosa. Tragically, on her way from Spain to join him, Rosa was lost at sea. Pedro then completed the window as a declaration of enduring love.