On Friday I came across a photo that I've decided is amazing enough to be added to my All-Time-Most-Spectacular-Photos-Ever list. This comes by way of Reality-Based-Community:
This is an underwater photo of a scuba diver swimming in the arctic under a giant slab of ice, which in turn is illuminated by the aurora borealis, and by all accounts isn't photo-shopped. Wow.
My other favorite photo (which also shows the awesome beauty, and power, this planet has) is of a volcanic ash cloud that was so charged with static electricity that lightening discharged across it. Also not photo-shopped.