A DM can place these portals anywhere in the game. Great for Events or DM Mischief( place one portal in a Newbie area and place the other portal at the feet of a Lvl60 Dragon. That'll put some fear into those KnowItAll Newbies).
5 sets of portals have been created.
A DM will find these under Placeables-->Special-->Custom 1-5. Each Custom has a pair of portals that will port to each other.