Exploration based PC Games?

I'm looking for a game that's mostly based on exploration. Something kind of artsy that I can just sit down and immerse myself into. I don't want any suggestions like Skyrim or New Vegas or Minecraft or anything. I want something that's new and completely foreign. A game that's eerie is some parts but has amazing architecture and scenery in others. I'm not interested in Dear Esther, I want something more open. Proteus is a good example, but I want something more than that. I don't want a game that I know I'm completely safe in, if you know what I mean? I appreciate any suggestions.

Journey maybe? I don't know what you are exactly looking for but Journey might fit. It is a fun game witha good soundtrack, story and scenery.

Antichamber is a puzzle game based mainly around exploration. Its a very interesting game and it will make you think about many things it may even blow your mind at times. Sir you are being hunted is another game that you may like. If your interested in antichamber its one of the games currently on humblebundle indie bundle 11.

My recommendations would be Runescape, Rift or WoW