The Island of Dr. Hibbert

The  is a limited-time premium decoration that was released on October 4, 2016, as part of Act 1 of the Treehouse of Horror XXVII Event. It rewarded the player with 530 MAG Points upon placement.

It returned on January 23, 2018 during the Bart Royale 2018 Event in the Doomsday Mystery Box

About
It's an island where Dr. Hibbert turned springfielders into "manimals" during the Treehouse of Horror XIII episode.

Trivia

 * Only one can be purchased.
 * It can only be placed on the ocean.
 * Despite it being named after him, Dr. Hibbert does not have an associated job or questline.