In observance of John Muir's birthday -- April 21, the day before Earth Day -- we put a together a brief Google Earth presentation highlighting some of the pivotal places and events in the great man's life. It's just a beginning. We hope to keep adding entries as we go. In the meantime, have a look. You'll need Google Earth for the full 3-D experience, but don't worry, it's a free download. And, if you prefer, just can see the text and pictures here. Enjoy.