Note: Due to the discovery of boxwood blight, the arboretum has closed ... The area's bonsai trees sit in the National Bonsai & Penjing Museum, which boasts an astounding 300 miniature trees ...

If you've never been to Washington, D.C. before, plan to spend some time along the Tidal Basin, an approximately 107-acre pond encircled by a 2.1-mile loop trail. Constructed to use the strong ...