There are more than 500 animal and 3,000 plant species in the Cincinnati Zoo and Botanical Gardens, which means that it has the largest zoo collection in the United States. The zoo’s innovative birthing programs are also widely known. The Cincinnati Zoo does impressive work with endangered species like black rhinos. The zoo features a wide range of activities and animals and is the perfect place to spend the day with kids. The Cincinnati Zoo and Botanical Gardens are one of the most popular attractions for locals and visitors alike. About ten miles from Mariemont Inn is the second-oldest zoo in the United States.