The San Diego California Temple (image from LDS Media Library)
An interesting short treatment of a symbol that appears in other temples, as well:
http://www.ldsliving.com/Why-This-Symbol-Appears-10-000-Times-in-the-San-Diego-Temple/s/79150?utm_source=Facebook&utm_medium=Social&utm_campaign=mormonsarecool
Thanks to Helen Condon for calling my attention to it.