I want to go to there
"Harvard University's Arnold Arboretum in Jamaica Plain, Boston, Massachusetts is one of the oldest, largest, and most famous arboretum in the United States. It was established in 1872 on 107 ha (264 acres) of land in the Jamaica Plain section of Boston and was guided for many years by Charles Sprague Sargent who was appointed the Arboretum's first director in 1873 and spent the following 54 years shaping the policies. By an arrangement with the city of Boston, the Arnold Arboretum became part of the famous "Emerald Necklace", the 10 km (7 mile) long network of parks and parkways that Frederick Law Olmsted laid out for the Boston Parks Department between 1878 and 1892."
Holden Arboretum
"The Holden Arboretum, in Kirtland, Ohio, USA, is one of the largest arboretums and botanical gardens in the United States, with over 3,400 acres (1,376 ha), 600 acres (243 ha) of which are devoted to collections and gardens. The Arboretum is named for Albert Fairchild Holden, a mining engineer and executive, who had considered making Harvard University's Arnold Arboretum his beneficiary. However, his sister, Roberta Holden Bole, convinced him that Cleveland deserved its own arboretum. Thus Mr. Holden established an arboretum in memory of his deceased daughter, Elizabeth Davis."
United States National Arboretum
"In 1927 the United States National Arboretum was established in Washington, D.C. on 180 ha (444 acres) of land; currently it receives over half a million annual visitors. Single-genus groupings include apples, azaleas, boxwoods, dogwoods, hollies, magnolias and maples. Other major garden features include collections of herbaceous and aquatic plants, the National Bonsai and Penjing Museum, the Asian Collections, the Conifer Collections, native plant collections, the National Herb Garden and the National Grove of State Trees. A unique feature of the U.S. National Arboretum is the National Capitol Columns, 23 Corinthian columns that were used in the United States Capitol from 1828 until 1958."
Source: Arboretum. (n.d.). Wikipedia. Retrieved August 19, 2010, from http://en.wikipedia.org/wiki/Arboretum