This is officially the world's largest QR code. Carved into a field of maize in Alberta, Canada, it measures 309,570 Square feet and links to the Kraay Family Farm website. It is also dumber than every other stupid QR code that exists.
Photographs of it—all invariably taken at an angle unless the photographer happens to be a satellite—don't seem to work particularly well with QR readers. Which means that the only people able to make use of it are helicopter pilots. So, that's worth it. [Kraay Family Farm via CBC]