A few thoughts off the top of my head:
Industry Hills Eisenhower Course holes 14 and 17. With the 14th, as soon as you exit the 13th green stage left, walk between the bunkers on the left and you will see the original teeing ground for the 14th, which they never use anymore. Instead of plyaing 461, it plays about 365. Ordinarily, this hole would play into the breeze. The 17th hole's tee is way on top of the hill, which, if you look at it for the first time, you might think it is just part of the old Puente Hills no.2 landfill site.
Weyhill, which I have wrote about in my home course, has some hidden tees no longer used--the 5th, 13th, 16th and 17th all come to mind. If SVCC restored the original 5th back tee, that hole would really be something special.
Also, take a look at the player's card for Kiawah's Ocean Course--Dye placed in tees when designing the course that push it to about 7630. Some were used in the 1991 Ryder Cup, but there are plenty of others that exist. For example, the 17th played at 197 for the Ryder Cup, but there is a tee well back at 219.