The gate near the back door cannot be opened at all. The gate near the library can only be opened from the inside, it's the way out of the undertemple. The way in to the undertemple is through the big serpent statue in the room with the brazier.
I found the four monkey idols:
1. Beyond the kitchen, go via the elevator, down a corridor and another elevator to two levels.
2. The coin lock rooms, one has an idol.
3. Near the back door, just before all those stairs up.
4. Carried by a running monkey after you release all those monkeys in the room with the hole in the floor - he can be anywhere by now!
There is another door (not gate) which has no obvious way through. It is opposite the front door, up the ramp, behind the wall and down the slope (you know the one). You get in by finding the small octagonal room behind it with four exits and a wooden floor with gaps at the corners and a pillar in the middle, drop through one of the gaps and you will be behind the door which you can then open from the inside. Nothing much in there though.
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