It's actually hard to spend money on activities in D.C. All of the Smithsonian museums and national memorials are free, as are many other museums and attractions. Summertime is heaven for budget travelers when free outdoor concerts and festivals occur every week.
Anacostia Museum for African American History
Arthur M. Sackler Gallery
Bureau of Engraving & Printing
Corcoran Gallery of Art (free Thursday after 9 PM)
DAR Museum
Folger Shakespeare Library
Freer Gallery of Art
Hirshhorn Museum & Sculpture Garden
Library of Congress
National Air and Space Museum
National Building Museum
National Gallery of Art
National Geographic Society
National Museum of African Art
National Museum of American History
National Museum of the American Indian
National Museum of Health and Medicine
National Museum of Natural History
National Portrait Gallery
National Postal Museum
National Zoological Park
Navy Museum
Phillips Collection (free weekdays)
Renwick Gallery
Smithsonian American Art Museum
Textile Museum
U.S. Holocaust Memorial Museum
African American Civil War Memorial
Franklin Delano Roosevelt Memorial
Jefferson Memorial
Korean War Veterans Memorial
Lincoln Memorial
National Law Enforcement Officers Memorial
National World War II Memorial
U.S. Navy Memorial & Naval Heritage Center
Vietnam Veterans Memorial
Vietnam Women's Memorial
Washington Monument
Anderson House
Dumbarton Oaks (free from November 1 to March 14)
Ford's Theatre
Franciscan Monastery
Kenilworth Aquatic Gardens
Kennedy Center tours
National Arboretum
National Shrine of the Immaculate Conception
Old Post Office Pavilion
Old Stone House
Rock Creek Park
Supreme Court of the United States
U.S. Capitol
U.S. Botanic Garden
Washington National Cathedral
White House
The Kennedy Center hosts free performances every day at 6 PM on the Millennium Stage. Also, every September, the Prelude Festival kicks off the Kennedy Center's fall performance schedule with many free events. Choral and church groups perform at the National Cathedral, often at no charge.
Summertime is the season for free concerts. Folk, pop, and rock bands perform gratis on Monday and Thursday nights atop Fort Reno park. You can also hear free jazz in the National Gallery of Art's Sculpture Garden Fridays in summer. The Carter Barron Amphitheatre in Rock Creek Park hosts free performances by the Shakespeare Theatre Company and free concerts throughout the spring and summer.
Performances of military music take place around the city. From June through August, the U.S. Navy Band, U.S. Air Force Band, U.S. Marine Band, and U.S. Army Band take turns playing free concerts on the grounds of the U.S. Capitol weekdays at 8 PM. You can also see the U.S. Marine Band every Friday night from May through August during the Evening Parade at the Marine Barracks. The event features music and precision marching.
Washington is a city of festivals, many of which are free to the public (food and souvenirs cost extra). When the weather turns warms, check the National Mall lawn and Pennsylvania Avenue for music and dance performances, concerts, talks, cooking demonstrations, parades, and more. For a complete list of annual events, visit the Washington, D.C. Convention and Tourism Corporation at www.washington.org.
TICKETPlace sells half-price tickets to Washington's theater and music events. If you're visiting in late October, reserve your seats early for D.C.'s Free Night of Theater.
Almost every day of the year, the Politics and Prose independent bookstore on Connecticut Avenue invites fiction and nonfiction authors to the store for book readings, talks, and Q&A sessions. It's a great chance to meet the faces behind the names on the New York Times Bestsellers' List.
Finally, if it's free flicks you're after, the Screen on the Green film festival shows movie classics for free on a giant screen on the National Mall. Screenings take place Monday nights in July and August.