Cincinnati is home to the country's second-oldest zoo. It's especially noted for its work with endangered species like black rhinos. The zoo is also known for its innovative birthing programs with animals like the Indian and Sumatran rhinos. On a visit here, you'll see everything from an arctic fox or an African lion to an Indian peacock or an Amazon milk frog.

According to one TripAdvisor, "the Cincinnati Zoo is quite small, but you would never know it from the amazing way they have laid it out and the abundance of animals that they have there." Other visitors agree that the Cincinnati Zoo & Botanical Garden feels spacious, though some mention that there are some serious hilly areas that make pushing a wheelchair or stroller rather difficult.

General admission to the zoo is $15; while tickets for seniors and kids ages 2 to 12 cost $10. Alternatively, you can purchase a "rides package," which includes zoo admission and unlimited carousel and train rides for $22 for adults and $17 for children and seniors. There's also the "value package," which includes zoo admission and one screening at the 4-D theater for $20 for adults and $15 for seniors and children. The zoo welcomes visitors every day (except Christmas) from 9 a.m. to 5 p.m; between Memorial Day and Labor Day, it stays open until 6 p.m. You'll find the zoo north of downtown Cincinnati on Vine Street. For more information, visit the website.