Ravensburger (16137) Castle Through The Seasons *18000* pieces: available on pre-order at Amazon UK (£169.99). This item will be released on 1 October 2021. : r/Jigsawpuzzles
18000 piece puzzle, "St. Columba Altarpiece," by Rogier van der Weyden, Educa Borras, Spain - a photo on Flickriver