DC

Government
Library of Congress
US Capital
Supreme Court
White House
National Archive

Museums
Smithsonian
National Museum of the Native Americans
National Gallery --- East Wing (modern art)
Corcoran Gallery of Art

Theaters
Kennedy Center
Arena Stage
Warner Theater

Memorials
Holocaust Museum
Vietnam Memorial
Jefferson Memorial
Lincoln Memorial
FDR Memorial
National World War II Memorial
Washington Monument

Neighborhoods and Other Interesting Things
Georgetown
Capital Hill
Union Station
National Zoo (Pandas) Friends of National Zoo
Metro (subway) --- Map --- Closest station to our house (5 minutes) is the Wiehle-Reston East stop at the western end of the Silver Line
Cabots Point (our neighborhood)

Maryland

Harper's Ferry - Nice 1/2 - 3/4 day trip. Beautiful and Historic Civil War town on the confluence of the Potomoc and Shenadoah Rivers.
Antietam Battlefield - Full day trip. One of the largest and most significant Civil War battlefields
St. Michaels - Full day trip. Quaint fishing community on the Cheasepeak Bay, nice museum.
Sycamore Island Club - 3-8 hours. Private canoe club located on a tiny island on the Potomoc River, just outside Washington DC, amazingly secluded for its proximity to Washington. Accessed via the C&O Canal path, which is also nice to see.

Virginia

Mt. Vernon - Nice 1/2 day. George Washington's house on the Potomoc, basically a southern plantation house. See the historic town of Alexandria on the way.
Colonial Williamsburg - Overnight or a very full day. First Capital of Virginia, historic colonial town, with great authentic taverns and food.
Manassas Battlefield - 2-3 hours. Local Civil War battlefield
National Air and Space Museum Annex - 2-3 hours. See all of the aircraft that are to large to put in the Air and Space Museum on the mall.
Great Falls Park 2-3 hours. Beautiful waterfall, hiking, and Potomoc River views.
Colvin Mill 1-2 hours. Local historic landmark
Reston --- Maps

Special Events

Cherry Blossom Info
Cherry Blossom Festival (March/April)
Smithsonian Kite Festival (March)
Military Through The Ages - Jamestown (March)