The Hubble Space Telescope recently published a high-resolution image of the amazing Sombrero Galaxy. Truly awe-inspiring, especially when you consider the scale.
This image was 211MB, labelled as "massive file", but of course in my work this is a teeny image. I upsampled it by 2X into 800MB of data, and here it is...
(click image for full-size interactive viewer)
Be sure to hit F11 to maximize your browser's window so you can see as much of the image as possible.
In case you're wondering, the magic here is: