The European Southern Observatory has a neat, high-res, zoomable image of the entire night sky up on their website. It’s a total of about 800 million pixels. Once you go to their website, click on Zoom In! and then use the slider at the bottom to zoom. There’s an amazing about of detail.
It wasn’t taken with a big exotic telescope. Instead the photorgapher (Segre Brunier) assembled it from 1,200 pictures taken with a Nikon D3.
It took about 340 hours of computer time to assemble the finished image.