Various zones from the Planes of Power expansion linked to various areas of the world in a "logical" order. As an example, the Planes of Disease is underneath the Temple of Bertoxxulous. The key to enter this plane is among the GMs that are found in that area and has an one time use among x players. Only good or neutral players are allowed to enter since this type of plane ~creates~ the evil in evil players. Perhaps allow the maximum level for a player to go to 65, but only these planar zones grant experience into this five extra levels. And as a twist, the equipment and powers gained only work in planar type zone and not in the current gaming zones (save for perhaps Air, Fear, and Hate).
Just a thought.
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