The Cleveland Botanical Garden is the first urban botanical garden established in the United States. The outdoor portion covers about 10 acres, and has a lot of separate gardens, our favorite is the Hershey Children's Garden, a great interactive kid-friendly place, complete with a cave, a tree-house, a watery bog, dwarf forests, and a worm bin. Our kids could spend hours here. The outdoor displays also include a Japanese tea garden, a beautiful rose garden, an herb garden that includes over 4,000 plants, and a shady woodland garden. Inside, you can see plants from the dry spiny desert of Madagascar and the lush cloud forest of Costa Rica, with everything in between.