SARAH CONNOR'S CRYPT
The arnold fans site:
http://www.thearnoldfans.com/news/166.htm
has details of filming in the Whittier cemetery: shooting location of T3's crypt heist. There are photos of the plain original "crypt" structure giving an idea of the talent and imagination going into T3.
The stainglass window that Arnie breaks through is actually something they built added on to the original structure. They added extra headstones and moved shrubbery around.