Could I have your opinion please?

I was offered 2 positions at approximately the same time at 2 different locations. The position I accepted, it is absolute chaos at that facility. I regret big time not taking the other position. I know it can't possibly be as crazy. Last I checked, the position is still open at the other facility. Would it be appropriate to call them back and ask if the offer would still stand or just forget it and go on? Since, I turned them down.