Ok, so I'm stuck. I don't know if getting the chest is really worth it, but the one I had found right before this one (underneath a stairwell) had a heart piece in it, and that's very important to me.
So anyways, I'll show the screenshot I took first. It'll probably make a lot more sense.
As you can see, there's the chest that the big key was in on the left. But there's another chest that's on the map right next to it. The problem is... it seems to be inside a wall, where I've pointed the fairy. I've tried blowing out the fire in both torches with the boomerang, and I've tried throwing the boomerang at the four pillars (in and out of order) a few times. Nothing. I cannot seem to find a way to get to the chest, but I don't want to leave it behind. Anyone have a clue?