Check out these local earthworks, all less than an hour away.
1. Cincinnati Mound Tour
Finneytown: At 5923 Winton Ridge Lane, at the south edge of the reservoir, a small driveway enters beside the “Finneytown Historic Cemetery.” In the middle among the early graves is a wide, low mound.
Take Winton Road to Cross County East, exit Montgomery Road Norwood, head north up the hill.
Norwood: A large, steep, elliptical, Adena mound stands at the crest of Norwood Heights, in a small park next to the water tower. Take Montgomery Road up the hill and turn right at the Mound Café, then look for the small driveway circa 2420 Indian Mound Avenue. See the Ancient Ohio Trail’s “Cincinnati and the Little Miami” Route. 
Continue out Montgomery Road, through the Pleasant Ridge business district.
Pleasant Ridge: A low mound is situated in a little triangular pocket park at 6666 Dante Avenue in Pleasant Ridge, at the intersection with Glen and Doon (off Montgomery Road to the left, two streets past Orchard Lane).
Take Kennedy Avenue to Duck Creek East, go through Madisonville and then down through Mariemont, and cross the bridge to Newtown. Go east on Main Street (Batavia Pike), then left on Round Bottom Road.
Newtown: TheOdd Fellows Cemetery Mound” is about 110 x 90 x 11 feet high, of Adena origin, and well preserved. Another mound known as OFCM-2 is also in the cemetery, though much smaller to the point of invisibility. The cemetery was established by the IOOF in 1863, and is also known as “Flagg Spring Cemetery.”
Optional: At the Newtown Municipal Center, 3537 Church Street, an interactive video exhibit showcases the spectacular but now lost earthworks of the Little Miami Valley, and the Cincinnati Museum Center’s recent archaeological investigations in nearby Clear Creek Park.
2. Shawnee Lookout Park and Miami Fort
Cross US 50 just a bit north of the canal trailhead and take Miamiview and Lawrenceburg Roads to the Park entrance (on its northern perimeter). Enter the park and follow the road past the golf course and a sharp bend to the right to the Log Cabin. The “Cabin View Picnic Area” should be a good spot for breakfast or lunch.
Continue to the end of the road and the trailhead for the “Miami Fort Trail” – a loop trail about the same length as the one at Rentschler Forest, but with more ups and downs.
You’ll see the well preserved earthen walls, a series of ancient interior ponds, and a large ravine that was part of the enclosed space. A short extension of the trail goes farther out to the point, where there is a small mound and the spectacular panorama of the Great Miami Confluence. See: Great Miami Route at  

3. Rentschler Forest Metro Park, Hamilton