my guess is this was taken with a D70s with a Sigma 10-20mm f/4-5.6 EX DC HSM for Nikon and from the clouds in the sky and the diffused light it looks to be taken in Niagara Falls Canada. I think I can hear a couple brothers somewhere around too.
I played with this in photoshop alittle bit and put the notes in the comments on the image. If you want me to take the image down let me know. Oh yeah and if I was completely wrong, ummm oops.
Great white on grey... Superb detail and excellent perspective and comp. You possibly could have gotten away with cropping a little more off the top, but it's no big deal. Well spotted and taken. Best wishes for the challenge - 7 :)
I think this could really have the pow factor if done in BW with high contrast. The linear quality of it works and anytime there is a repetition of something it gives it impact.