So I've finsihed the game and I have one Riddler Trophy left- the trophy that is on one of the little Islands near the Batcave. The only issue is I have no idea how to go back and get it. I passed it once when the story had Batman go to the Islands, but when I go back to the Batcave and stand on the ledge, the Islands don't seem to be there anymore.
I know you should be able to go back and find Riddler Trophies, which I've done, but this one is tough to get to without redoing the game.
Any help would be appreciated. Thanks!