Matt
I love the detail in #1 - especially given the fact you had a whole range of black tones to bring out and succeeded, thus giving the rich detail that the image (and the structure) deserve, but

I find the curve RHS conflicts with the rest of the image which is all sharp angles.
#2 - Better than #1 for me and again a beautiful exercise in bringing out the subtle tones in an image. You've kept all the detail without making the image look unnatural
#3- Saving the best for last. Awesome shot. This is what I love about viewing the work of others. There is nothing that gives me greater pleasure (well almost nothing) than that ah-hah moment when you see the creative vision of another give a different spin on the familiar. You've achieved that to perfection in this one. Interestingly this image is completely disconnected from it's subject (it could have been taken anywhere), yet succeeds because of the lovely geometrical qualities of the bridge superstructure. This is one you can come back to again and again.
Thanks for these.