Koko Crater Botanical Garden, Honolulu

This 200-acre stretch of Koko Crater was set aside in 1958, with a long-term (as yet only partially realized) plan of turning it into a botanical garden. Eventually, it will be a landscape where endangered plants suitable to this desert-like region can survive and flourish. Even in the early stages of development, visitors can find collections of plumeria and other flowers. A two-mile loop trail leads through dryland plant collections from around the world. No visitor facilities (restrooms, drinking fountains, etc.) have yet been constructed. Entrance to the garden is free.