Located in the FIxed Target Experimental Area is the Proton Laboratory, generally referred to as the Pagoda. The staircases in this building are possibly it's coolest feature.
I did quite a bit more post-processing on this picture than I normally do; it's actually an exposure blend that I did of an over-exposed, normally-exposed, and modified under-exposed version of the shot (thank you, RAW and a few extra stops of exposure adjustment), so the sky would pop out a bit more.
And, because I goofed with that post-processing, the EXIF data was removed from this picture. So: shot handheld at 1/200s, f/8, 44mm, ISO 100, taken with my Sigma 17-70mm DC Macro on my Canon EOS 40D.