Denver, Colorado maintains two bison herds descended from the last wild North American bison. There were as few as 18 bison left in Colorado at the beginning of the 1900s. Thankfully, the conservation project has been a success and Denver has been transferring bison to Native American tribes to start additional herds. The herds are just about 30 minutes from downtown if you ever visit.
More info, pictures, and video here: https://www.denvergov.org/Government/Agencies-Departments-Of...