Normally thieves/ intruders don't work the same block/neighborhood twice. People are naturally going to be on alert more and it'd be too risky for them. You shouldn't have to resort to hiding anything like that, with the exception of things of extreme worth. But even then, a safety deposit box or maybe even a personal safe (fireproof!) could do the trick.

I'd go with deadbolts and window locks, or maybe even bars over the windows if you're really that worried. (They don't look like prison bars... unless you want them to. Mostly they're just kinda decorative looking painted wrought- iron.) I know it looks ghetto as hell, but sometimes it's what's necessary if you want your stuff to be safe.