The hell levels...
Or camping in Ocean of Tears, for the Ancient Cyclops for the underwater breathing earring.
The epic dragon you had to camp, in the fire zone in Kunark... my roommate camped that for six days straight and lots of coffee, I think it was for the Shammy epic.
Or Raster in Guk, that was a fun camp; split the seven Frogloks but you could not AFK or there would be too many to handle again.