Field Trip Ideas in Washington D. C. to Learn About TreesUnited States National ArboretumThe United States National Arboretum is a beautiful 446-acre campus in Washington, D.C. which contains an array of display gardens, collections, and historical monuments set among native stands of eastern deciduous trees.3501 New York Avenue, NE, Washington, D. C. 20002-1958 Phone: 202-245-2726 Fax: 202-245-4575 Cost: Free for everyone
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