Land of the Dead

The Land of the Dead (also known as the Underworld) is a location where the souls of people (and plants) go after they die. Living people can enter the Land of the Dead by staring at a corner where two walls meet and crossing their eyes, which opens a portal. It's unknown whether this land exists in caverns underneath the Land of Ooo or if it's in some other dimension. The Land of the Dead is inhabited by many dead skeleton people who desperately want to eat flesh, as well as a variety of other strange monsters and insects. The ruler of the Land of the Dead is Death.

Features
A large, downward-moving escalator leads to the entrance, which is guarded by a creature that looks like a giant skeleton bird with one eye. The land is littered with bones, wrecked police cars, and flying saucers. The River of Forgetfulness that flows through the land gives amnesia to anyone who drinks from it, as Jake accidentally did, even though Finn told him not to. The river leads to Death's castle of light.