In 2011 I visited various gorgeous places in Iceland. This cave near Dyrholaey was one of them.
Here you can see a colored time-lapse version of the shot http://www.vimeo.com/julianvandieken/iceland
Adobe Lightroom & Adobe Photoshop.
Canon EOS 5D Mark II, Canon EF 24-70mm f/2.8L USM.
Photo Settings: 24mm, f/2, 1/3200 second, ISO 160.