If you enjoy the beauty of old, massive trees, as I do, then this site, passed along by our friend Byron at Hearts and Minds Bookstore is for you. In the left margin you'll find links to state registers for the largest trees of each species in each state. There's also information on "tree hunting", an activity in which people search out record trees in their states. It's pretty neat.
Another amazing site recommended to me by my student Hannah is Google Earth. The site allows you to navigate the globe from the perspective of a satellite and zoom in on any part of the planet you wish. The resolution of the satellite photos is best in urban areas, but it's impressive wherever you choose to zoom down. Unfortunately, the software has to be downloaded, which takes a while, but maybe the computer literate readers will be able to figure out how to just download Google Earth without having to download all the other stuff that comes with it.
Enjoy.