Check out this interesting site:
Here can view the Milky Way at 10 million light years from the Earth. Then move through space to Earth in successive orders of magnitude until you focus a tall oak tree just outside the National High Magnetic Field Laboratory in Tallahassee, Florida. The, begin to move from the actual size of a leaf into a microscopic world that reveals leaf cell walls, the cell nucleus, chromatin, DNA and finally, into the subatomic universe of electrons and protons.
Kind of puts things in perspective...