I thought about this thread because I recently visited the American Fur Store and Dr Beaumont Museum, on Mackinac Island in Michigan, US, which is largely dedicated to the curious and disturbing story of how medical science learned about the functions of gastric acids. It involves an accidental (or "accidental") shooting of a mixed-race trader at the shop, the ambitions of an amateur medical doctor (uh huh) with visions of academic grandeur, and years of careful but painful experimentation on a not-fully-willing human subject with an open musket wound that never healed. I was lucky enough to go on a day when the presiding ranger happened to be a volunteer who'd recently completed a PhD in historical medicine, so we talked for like an hour, haha. But if you are less dedicated than I, it's a two-room museum with interesting information that won't take very long to see, and admission is free with your ticket to see Fort Mackinaw on the hill up above, which is also worth seeing and which most visitors to the island will want to visit anyway.