The National Bonsai & Penjing Museum at the US National Arboretum on New York Avenue in North East DC houses an impressive collection of specimens, some over 350 years old. Almost any tree can be made into a bonsai and there are wide variety of species on display. These miniaturized plants represent a profound control of the human hand over nature and they are surprisingly robust for their delicate size. Many of the trees do require meticulous care from time to time, but generally they live outdoors fully among the elements. Beyond the Bonsai exhibit, the huge arboretum offers a great deal of natural and landscaped beauty and makes for a terrific bike ride.