My favorite presentation yesterday at the Microsoft Pro Photography Summit was by landscape photographer Frans Lanting. It began when he captured through his lens thousands of Horseshoe Crabs as they came out at night on the New Jersey shores. Frans felt like he was looking back in time, and began to wonder what other examples he could find and photograph. And that was the beginning of his project, LIFE: A Journey Through Time.
You can visit this project in many ways, through the book, via the traveling exhibit, and of course, seeing Frans speak in person. The web site also provides an excellent experience, and I think you would enjoy spending a little bit of your life there marveling at the photos and learning from the text.