Temporary dimensions

Basically the idea is to add a dimension that regenerates unique terrain every time a player enters it. i.e when the player leaves that dimension by either dying or going through a portal, the terrain in that dimension is deleted.  When a player enters the dimension again, the terrain regenerates using a unique seed.  Rinse repeat.  It would be a way to let players explore entirely new worlds without actually making a new world outright.  Which would be especially handy on servers.  As for how to access it, I think it would be interesting to enter via another method than portals since that's been done to death with the nether and end.  eg. a ritual similar to how the ender dragon is respawned or something.