Lumpy Space School

Description
It first appeared in Trouble in Lumpy Space where the prom happened and where Finn and Jake was cured from the Lumps It is unknown if The Lumps Antidote was left there or if it was returned to the Makeout Point.Lumpy Space Princess also celebrated her birthday there as seen in The Eyes.

Trivia

 * It only appeared in 2 episodes of Adventure Time.
 * It is located near Makeout Point.
 * A smoothie can go there without any cars by having three Lumpy Space Folks bite you and give you the Lumps.