I was editing some pictures from my recent trip to Whistler, BC and was playing around with the transform sliders under Lens Correction. What I discovered was that I could alter the perspective (i.e. wide angled-ness) by using the distortion, vertical and/or horizontal sliders.
My original image was taken landscape as you can see below
Using the distortion, vertical and horizontal Lens Correction sliders I was able to change the layout to portrait but keep the river and the gazebo in shot.