How does this work for you?
Here is how I did it.
1) Add a 150 pixel white border on the right side of the image
2) Straighten on one of the horizontal lines on the walkway about half way up.
3) Crop to the aspect ratio you want (4x6 was the original and my version)
4) Clone in some grass and walkway on the remaining white border after cropping.
5) Curve layer with the top quadrant anchored, a good size push up in the middle and a slight push down at the dark end for contrast.
6) a little USM sharpening to fix the softness that occurs after downsizing for the web.
I would be tempted to do a B&W conversion also, as the color isn't that strong in this image. But I didn't do a conversion so you could see the potential of your orginal.
Tim