Harrison County
The saving grace of counties in Indiana beginning with H. Chock full of natural areas, rivers, caves, trails, etc. Home of Indiana's original state capitol, Corydon, which is worth a visit if you're interested in Indiana history. The Adventure Trail of Harrison-Crawford State Forest is here; you can make a good three or more day hike out of it. The Blue River forms the boundary between Harrison and Crawford Counties.
Post Oak-Cedar Nature Preserve