The Hong Kong University of Science and Technology’s Antique Maps Database: “The Antique Maps of China collection includes more than 230 maps, charts, pictures, books and atlases. It represents almost all samples of China maps produced by European cartographers from the 16th to 19th centuries. This cartographic archive vividly records the long history of cross-cultural exchanges between China and the West.” The full-sized images are PDF files. Thanks to peacay for the link.