The Elf writes:
. . .are the rather obscure ones: the one with all those hanging cages with rather junky amulets in them, the one you can find if you continue on past both killing the Queen Spider and finding the cobra eggs, and the one that has the pedestal that takes you back to the entry, not just to the junction of the route to find the little girl. If you just barrel through the three quests, you also might miss the side room with all the spiders and an entrance to yet another door, said side room being opposite the hall with the room with the "sacred" (rather profane!) urn.