High Quality Content by WIKIPEDIA articles! The National Bonsai Foundation (NBF) is a nonprofit organization that was created to sustain the National Bonsai and Penjing Museum. NBF also helps the United States National Arboretum show the arts of Bonsai and Penjing. The National Bonsai and Penjing Museum is located on the 446-acre (1.80 km2) campus of the US National Arboretum in northeast Washington, D.C. Each year over 200,000 people visit the museum. Distinguished national and international guests of various Federal Departments are also among the visitors.