This image was created from 3,000 individual photos stitched together into a single image that is 280,000 x 140,000 pixels. That's around 40 gigapixels, or 40,000 megapixels. If you printed this photo it would be 23 meters (or 78 feet) long!
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World's Largest indoor Photo: Strahov Philosophical Library, Prague - 40 Gigapixel 360 Panorama