Games with Huge Worlds/Replayability

I should probably post in a few weeks time, but games would you recommend with expansive worlds and lots of replayability? I recently bought a GTX 970 and I barely have any games to play on it.

Edit: WSIB! Oh god... edit 2: Also a bit of a graphics whore, I love indie games but I'm looking for things to justify my £270 purchase atm :P

Stuff I already have:

• Crysis 2
• Arma 2
• Dead Rising 3
• Sniper Elite V2
• JC2
• Witcher 2 Full list here: http://steamcommunity.com/id/procrastinatorvot/games/?tab=all