One of our most remarkable discoveries in Washington, D.C. is the National Arboretum which includes the National Bonsai and Penjing Museum. We love arboretums and gardens. We have visited them all over the United States and into Canada. But this is one of the most spectacular gardens and collections of trees and plants we have ever seen. This is the entrance to one of the sections of the National Bonsai and Penjing Museum.