The famous double spiral staircase of the Vatican Museum.
I find it pleasingly ironic that the architechtural centrepeice of the Vatican museum resembles a double helix :)
Photoshop has completely screwed up all the EXIF info and all the values are wrong (lens, exposure mode etc). I tried to recover the data from the original version but I cannot get Flickr to accept the new data. Oh well, the important bits are below.
Sigma 10-20mm F/4-5.6 EX DC HSM
1/50s @ F4.0
Auto White Balance
Aperture Priority mode
Photoshop: selectively desaturated the people to make them less distracting from the spiral.
Explored - Highest position #15