Titan Quest is an RPG (you CAN play online) which takes place in Greece, sometime in the mythological era. It's a very good Diablo-type dungeon-runner. Great level-up styles and skills can make your character---whose class you may choose of eight---as strong as possible. Great graphics and shines. A 3-D feature is using your mouse button 3, which zooms in at a curve from high above.
Very fun game. Now go and buy it ($19.95)!