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More than 400 acres of various species of trees, flowers and plant life are on the arboretum's grounds. Includes displays of bonsai trees and the potential use of plants as fuel. U.S. National Arboretum 3501 New York Ave. NE, Washington, DC | 202-245-2726

An expression of colors as seen at the ocean's deepest depths. National Museum of Natural History - Smithsonian Institution 10th Street and Constitution Avenue NW, Washington, DC | 202-633-1000

More than 80 works from the famed landscape photographer. The Wilderness Society 1615 M St. NW, Washington, DC | 202-833-2300

Various artifacts and memorabilia from the career of performer Phyllis Diller, including a metal file drawer with more than 50,000 jokes and gags. National Museum of American History - Smithsonian Institution 14th Street and Constitution Avenue, Washington, DC | 202-633-1000

An exhibition looking at how money has changed from Colonial days to the present. National Museum of American History - Smithsonian Institution 14th Street and Constitution Avenue, Washington, DC | 202-633-1000

Recent Japanese pottery that reflects how potters used ancient methods to create modern forms. Arthur M. Sackler Gallery - Smithsonian Institution 1050 Independence Ave. SW, Washington, DC | 202-633-1000

The precious stone is exhibited for the first time as a stand-alone gem while a new, permanent setting is fabricated. National Museum of Natural History - Smithsonian Institution 10th Street and Constitution Avenue NW, Washington, DC | 202-633-1000

View images of Earth taken from satellites. At the Madison Building. Library of Congress - James Madison Bldg. 101 Independence Ave. SE, Washington, DC | 202-707-5000

An exhibit on Washington's movie palaces with film clips of street cars featured in the silent films starring comedian Harold Lloyd. At the Northwest Branch Park. National Capital Trolley Museum 1313 Bonifant Rd., Colesville, MD | 301-384-6088

This changing display recognizing Ronald Reagan will feature hand-written documents and other artifacts, including a bronze cast of the Moscow Kremlin. National Archives and Records Administration Constitution Avenue between Seventh and Ninth streets NW, Washington, DC | 202-357-5000