I live in Mid/Northern VA, so our opportunities are pretty literally endless: Civil war battlefields & related too numerous to count, historic homes & plantations every few miles (and downtown, about every other house), President's homes, all of Washington DC & the Smithsonian, The Library of Congress (we have part of this right in town, the rest is an hour away), historic downtowns that include local museums and the like (there are 5 withing a half hour drive of us), a National Park, several state parks, wildlife preserves, bird preserves... The list goes on. We're doing a bug larvae count in October. We ID, collect, and prepare wild foods and mushrooms (I am putting together my own book, actually).
Honestly, this is one of the reasons we moved here.
ETA: We do not have children or home school, but we believe that no one should ever stop learning. I took my nephew to a lot of these places while he was here, though in a much bigger rush than if he were in school, obviously, since he was just here for a week.
"This isn't life in the fast lane, it's life in oncomming traffic." -Terry Pratchett