Note to self: The Tavern Rock Cave, where Meriwether Lewis almost fell to his death, is 45 minutes from the St. Albans Lake (walking at a fair pace mind you), not “just 20”, no matter what the students claim.
It’s a little tricky to get to, and we couldn’t spend more than a few minutes there because of the longer than expected walk, but it’s a nice place to visit because of the history and beautiful geology (jointed limestone and dolomite outcrops; scree slopes at the angle of repose; Ordovician fossil imprints).
P.S. The National Park Service has an excellent site on the Lewis and Clark Expedition that includes maps, their itinerary, and a long list of sites they visited.