Geograph - photograph every grid square

Use the Browser search and add "larger:1024" (without quotes) to the end of your keyword query (works with 641, 800, 1024, 1600, 3000) - example https://www.geograph.org.uk/browser/#!/q=bridge+larger%3A1024

... restricts the results to images that have resolution at least 1024 pixels on the longest dimension.