The Nightosphere Jail is the prison in the Nightosphere where they keep the "dummy demons." Finn and Jake were briefly locked in a cell here, in the episode "Return to the Nightosphere."
The jail is a long shaft, going deep into the ground. The only entrance shown is a hole at the top that leads to the surface of the Nightosphere. The walls are riddled with dozens of jail cells, each of which contains a demon. Many stalactites and stalagmites adorn the walls and floor. A large, circular cage is in the middle of the floor. It was being used to hold the "stuff" (bananas), but Finn and Jake were thrown in there due to over-crowding. Near the large cage is a statue of Hunson Abadeer, in his monstrous form, with a plaque that reads:
HUNSON ABADEER
OUR GREAT LEADER
IS WITH US FOR
ETERNITY
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