Objects that Block View???

So in my game; FALLOUT ANARCHY, I want to make it where you can’t see past walls. Because then if there’s something bad or really good behind it, you’ll know exactly what to do. And I don’t want that because it ruins the fun and feel of realism in the game. http://flowlab.io/game/play/1009901

Raycast sounds like it may be a good idea but idk what or how it would be used

Okay, thank you. I think I’ll look into the possibilities… If I don’t come up with anything, I’ll let you know.

Nothing. /=|
I looked into it, and found nothing. I’m not giving up though.