Pat, when you say 1 & 3 I am assuming you're talking about the bridge & canal shots, right?
All of these are 3 exposure HDRs (+/-2 bracketing) merged with HDR Efex Pro 2. I then post-processed the 3 bridge HDR tiffs in Color Efex Pro 4, adding Color Contrast and Bleach Bypass filters. I thought it really brought out the age on the steel and gave an extra eerie feeling to the colors.
Here's a side-by-side of the top image, left is as it came out of HDR Efex Pro 2, right is after Color Efex Pro 4.
And after this I did a few more adjustments in Lightroom until I got it where I liked it, including the crop adjustment mentioned above.