Buckeye Furnace is a reconstructed charcoal-fired iron blast furnace with original stack, typical of those operating in southeastern Ohio's Hanging Rock Iron Region more than a century ago.
Cedar Bog Nature Preserve is the largest and best example of a boreal and prairie fen complex in Ohio.
Flint Ridge seems to have been well known in the ancient world, as small amounts of Flint Ridge flint have been found at Native American sites across the present-day eastern United States.
Fort Ancient features 18,000 feet of earthen walls built 2,000 years ago by American Indians who used the shoulder blades of deer, split elk antler, clam shell hoes and digging sticks to dig the dirt.
Fort Hill State Memorial is a nature preserve containing one of the best preserved Indian hilltop enclosures in North America.
The Glacial Grooves on the north side of Kelleys Island are the largest easily accessible such grooves in the world. They were scoured into solid limestone bedrock about 18,000 years ago by the great ice sheet which covered part of North America.
Perched on a ridge just outside the village of Leo, Leo Petroglyph is a legacy of the American Indian peoples of ancient Ohio.
Serpent Mound is a physical embodiment of Ohio’s very long history. Thousands of years ago Native Ohioans populated the landscape with mounds and massive earthworks.
Wahkeena Nature Preserve support plants that would normally be in a more northern climate and also some southern species. The hemlock trees which line the Shelter Trail are the most notable northern examples, while rhododendron and mountain laurel represent the south.