Undead Cave

The Undead Cave can be found South of Khorad-Nur at the X:

The inside of the cave is pretty small, which sometimes can be a good thing since you can run in and out very fast to re-spawn the cave as you defeat all the enemies in it:

What makes this cave interesting is the statue at the rear of the cave:

The cave is filled with the Undead and with the help of the statue you can kill them all pretty quickly, because of this you can get a good amount of experience fast. They can also have good drops on occasion: