I have played most, if not all, the RPG games published in the past 10 years or so...as single player. I am very curious to try playing on line. I am looking for suggestions as to what to play. I have some guidelines which may narrow the scope. I am not really interested in playing for a guild or a team, I want to be able to explore the world on my own, interact and fight other people or creatures. Basically what I have been doing with single player but with other people populating the world. Any suggestions? Don't mind if it's free or pay.