There is a small array of Tubes in Atlanta (Buckhead) that has often caugth my eye. Next time I will go there, it will definately be a night or dusk when they are illuminated but I do think they are very interesting.
The blue sky lend itself to to some up-shots which with the usual grey sky we have here lately would not be as appealing.
[caption id="" align="alignnone" width="300" caption="Tubes"][/caption]
And of course my alwats (2nd) favorite High-Rise that I picked up on the way
[caption id="" align="alignnone" width="300" caption="Park Place"][/caption]