Weighing in at a massive 46 billion pixels, a new image of the Milky Way from the astronomers at Ruhr University Bochum in Germany is the largest astronomical image of all time.
http://www.bbc.com/earth/story/20151028-at-a-massive-46-billion-pixels-this-is-the-largest-image-of-space
The viewing tool is here.
http://astro.vm.rub.de/
Amazing!
And with my new rural FTTC (Fibre To The Cabinet) broadband I can scroll around to my heart's content.
Strange considering the effort but I don't find it aesthetically very interesting.