Check out the worlds most detailed digital photo: An 80 GigaPixel Panorama of London

This is pretty impressive - very much along the lines of Google Earth but from a panoramic perspective and definitely worth showing to your students. 

This is an 80-gigapixel panoramic photo, made from 7886 individual images. This panorama was shot from the top of the Centre Point building in central London, in the summer of 2010. We hope that the varied sights and energy of London have been captured here in a way never done before, so that you can experience one of the world's great cities - wherever you may be right now.

To control this image, use the controls on the screen or click and hold your mouse button on the photo, and move your mouse around. To zoom in and out, use your mouse wheel, or the "Shift" and "Control" keys. Be sure to zoom in all the way to see the full detail of the photo!

There are some great interactive elements to explore with your students including treasure hunts and tell a story. 

Take a look at it here.