National Arboretum - Washington, DC
The United States National Arboretum is located in Washington, D.C., operated by the United States Department of Agriculture's Agricultural Research Service. It was established in 1927. It is 446 acres in size, and is located 2.2 miles northeast of the Capitol building, with entrances on New York Avenue and R Street. Nine miles of roadways wind through and connect the numerous gardens and collections on the campus.
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