thumbnails list of pages

With an earlier website I saw the possibility to make a list of maps visible by thumbnails.
In the filesystem there was a folder named fotoos with subfolders.
Each subfolder contained a image gallery (Amiant).
At the page fotoos there was a block pagelist where all the subfolders were exposed as a thumbnail. The thumbnail could be chosen from a subfolder and was a link to the image gallery. I can't find the solution to create it again.
Anyone can help?

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