Jelly World
In a very distant corner of Neopia, a strange town exists built entirely of orange jelly. Nobody knows how it got there, perhaps a magic spell that backfired, or perhaps it was commissioned by an eccentric Neopian billionaire with a sweet tooth, who knows! Visitors are always reminded to not eat the buildings.
The first reference to Jelly World was in the New Features section on 30th March 2002, where it says "...and of course the upcoming new world 'Jelly World'...". Countless times The Neopets Team has denied the existence of Jelly World (which, interestingly, was TNT's first reaction to Robotic Pets - See New Features 18th December 2000). It is their own little secret :)
Jelly World has had several links to by people claiming it exists, including one in a quote by Prisoner Five in Cellblock, but the real link is: http://www.neopets.com/jelly
The most notable attraction is the Giant Jelly, simliar to the Giant Omelette in Tyrannia, but each plate of jelly only gives out two servings.
Jelly World was also involved in the minor Missing Petpet plot, where millions of Petpets attached to a Neopet ran away on the 12th June 2003. They were, in fact, gorging themselves on the Green Jelly in Jelly World and shortly returned on the 24th June 2003.