One of Mainz's major attractions is the Gutenberg Museum. This museum is close to Mainz Cathedral and it was not open on Monday, but we booked it for a group so we could still go in. Gutenberg, the father of modern printing technology, although hundreds of years later than Bisheng, invented lead-type printing in Europe, and also invented the printing press. His inventions were rapidly popularized in Europe. The museum holds the Gutenberg printed Bible, and the thick Bible is printed out and hand-decorated by the monks, and the first sentence is thickened, so each book is a unique treasure.