by Marcos Maté
ATM Milano Serie 1500 puzzle, based on an original photo by Marcos Maté (photo copyright Marcos Maté -- used with permission). Photographed at Milan, Italy, July 23, 2018.
The "Easy" version of the puzzle has about 100 pieces, "Medium" has about 200 pieces, "Hard" is about 300 pieces. For the Online puzzles, see the Online Puzzle Tips.