Stop whatever you're doing and have a play with this. One of our favourite photographers, Will Pearson, has put up another stunningly detailed panorama of London on his website. The gigapixel image, taken by stitching together many different hi-res photographs, is best viewed in full screen mode.
And when you've finished with that one, Will's got a range of other high definition photos of London on his website. Take the morning off and go explore.