Right-click any pin, choose "Open image in new tab", and look at the URL. You'll get something like this:

https://i.pinimg.com/236x/3f/8a/c1/3f8ac1d29e4b7f0a6c5d2e1b9a8f7c6d.jpg

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That 236x is not decoration. It means you are looking at a copy resized to 236 pixels wide, the size the home grid needs. The original file the creator uploaded is still sitting on the same CDN, one folder away.

I went down this rabbit hole while building a media extractor, and the URL structure turned out to be one of the cleanest CDN designs I've worked with.…