Some of the best jigsaw puzzles made come from Ravensburger, a Ravensburg, Germany company. Every piece is unique and the puzzles can be near impossible and delight to complete. They are available at every toystore and most toy departments of larger stores in town and well worth the somewhat premium price. The more unique puzzles and very large ones will be a little harder to find, but try a toy store rather than a department store. The toy store in
Stachus has a decent collection.
Here's their website.
This particular puzzle has
18 thousand pieces and is 276 x 192 cm:

Edit: Thanks - Corrected, still 18k is a lot!