tl;dr: The Shimano Bicycle Museum in Sakai, Japan (near Osaka) is a well-designed, spacious collection focused on the history and variety of bicycles rather than Shimano corporate history or merchandise. Exhibits range from early hobby horses to pro race bikes (like Freddy Maertens' Flandria), postal bikes, and a disassembled modern race bike showing all 3,200 parts, plus a research archive. Admission is cheap (around JPY 500), and there's no gift shop hard-sell on the way out.