Oregonia is a city in Warren County.
- Fort Ancient State Memorial  6123 State Route 350, Oregonia, OH 45054 (800) 283-8904. Built over 2,000 years ago by Ohio's Hopewell Indians, Fort Ancient is North America's largest prehistoric Indian hilltop enclosure. Feel the energy of the spirits as you venture amidst the 18,000 feet of tree-covered earthen walls, and within the museum that brings to life 15,000 years of American Indian heritage in the Ohio Valley.
- Celebration: A Gathering of Four Directions This annual American Indian hilltop event takes place every June at Fort Ancient State Memorial. Vendors, drummers, and dancers celebrate in full regalia. Activities include archery, spear throwing, tomahawk throwing, and pottery making.
- Morgan's Canoe and Outdoor Center  5701 State Route 350, Oregonia, OH 45054 (800) 932-2663. Morgan’s Canoe Livery at Ft. Ancient on the Little Miami River is the only canoeing company and private property actually located in the pristine Ft. Ancient Gorge of the Little Miami River. You will enjoy steep wooded hillsides, frequent small rapids and great swimming and picnicking spots in this part of the river.
- Devil's Staircase Motorcycle Hillclimb Cheer on motorcycle thrill-seekers as they race uphill at this exciting annual October event.