United States National Arboretum in Washington D.C., USA

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One can enter the United States National Arboretum from New York Avenue and R Street. 15 kilometers of trails are perfect for walking. The Arboretum is divided into several theme gardens with rhododendrons, boxwood, daffodils, maples and many other plants and trees. There is also a water plants garden, an Asian garden, a Ferns garden and a National grass garden on the territory of the Arboretum.

Admission is free.