Arlington National Cemetery
Memorial Drive, Arlington. 8 a.m.-7 p.m. Admission free. 703/607-8000.
n Changing of the guard at the Tomb of the Unknowns. Starting every 30 minutes, 8 a.m.-7 p.m.
Bureau of Engraving and Printing
14th and C streets SW. Visitor center: 8:30 a.m.-3:30 p.m. Tours: 9 a.m.-2 p.m. Monday-Friday. Metro: Smithsonian. 202/874-2330.
n U.S. paper-currency tours every 15 minutes 9 a.m.-2 p.m. and 5-7 p.m. Monday-Friday. Photo ID required. Bags not allowed on the tour. 866/874-2330.
Clara Barton National Historic Site
5801 Oxford Road, Glen Echo. Admission free. 10 a.m.-4 p.m. daily. Tours on the hour, starting at 10 a.m. 301/492-6245.
n The 1997 discovery of Clara Barton's 1861-1868 Office to Locate Missing Soldiers.
Department of the Treasury
15th Street and Pennsylvania Avenue NW. 202/622-0896.
n Saturday morning tours are available by reservation only and must be made through congressional offices.
10th and E streets NW. 202/324-3447.
n Tours suspended until further notice.
Hillwood Museum and Gardens
4155 Linnean Ave. NW. Reservations required. 202/686-5807.
South bank of the Tidal Basin. 202/426-6841. Open 8 a.m.-midnight. Metro: Smithsonian.
n Museum exhibits 9 a.m.-5 p.m. daily.
F Street and New Hampshire Avenue NW. 202/416-8340.
n Tours 10 a.m.-5 p.m. Monday-Friday, 10 a.m.-1 p.m. Saturday, Sunday. Free.
Constitution Avenue and 23rd Street NW. 8 a.m.-midnight daily. Metro: Foggy Bottom. 202/426-6841.
n Museum exhibits 9 a.m.-5 p.m. daily.
The Annapolis Maritime Museum's tours of the Thomas Point Shoal Lighthouse. 9 a.m., noon, 3 p.m. Aug. 11, 12, 25, 26; Sept. 15, 16, 22, 23, 29, 30. Only 18 passengers per tour; all must be at least 4 feet tall. Reservations required. 410/295-0104 or annapolismaritimemuseum.org.
James Madison's home and burial place on Route 20, four miles south of Orange, Va. 9:30 a.m.-5 p.m. daily for tours. Admission $3.50-$7.50. 540/672-2728.
George and Martha Washington's home and burial place at the south end of George Washington Memorial Parkway includes 25 new expanded galleries and theaters. 8 a.m.-5 p.m. April-August. $6-$13, children under 5 admitted free. 703/780-2000.
n George Washington's Gristmill and Distillery. Admission to the site is $4 for adults, $2 for children ages 6-11, and free for children 5 and under. When combined with admission to Mount Vernon, tickets are $2 for adults, $1.50 for children ages 6-11, and free for children 5 and under.
Pennsylvania Avenue between Seventh and Ninth streets NW. 9 a.m.-5 p.m. Metro: Archives-Navy Memorial. 202/501-5000.
n Museum housing the Declaration of Independence, the U.S. Constitution including Bill of Rights.
National Shrine of the Immaculate Conception
Michigan Avenue and Fourth Street NE. 202/526-8300.
n Guided tours. 9-11 a.m. and 1-3 p.m. Monday-Saturday, 1:30-4 p.m. Sunday
National World War II Memorial
17th Street between Constitution and Independence avenues NW. The public may visit 24 hours a day but rangers on hand to answer questions from 9:30 a.m.-11:30 p.m. daily. 800/639-4WW2.
9000 Richmond Highway, south of Alexandria. 10 a.m.-4 p.m. daily. 703/780-4000, Ext. 27.
n Limited group tours available. Public tours must be reserved through your congressional office. 703/695-3325.
Franklin D. Roosevelt Memorial
West Basin Drive. Metro: Smithsonian. Open 24 hours daily. Interpretive ranger staff on hand to answer questions 8 a.m.-midnight. 202/426-6841.
n Site explores the legacy of the 32nd president, 9 a.m.-5 p.m.
n Old Town Trolley's two-hour day tours make 18 stops including the White House, the Capitol and Arlington National Cemetery. Tours run 9 a.m.-5:30 p.m. daily. $32 adults, $16 children, free for children under 3. Evening tours also available. 202/832-9800.
First Street and Constitution Avenue NW. 9 a.m.-4:30 p.m. Monday-Saturday. 202/225-6827.
n Tours available 9 a.m.-4 p.m. Free timed tickets can be obtained at 8:15 a.m. on the day of tour at the West Front of the Capitol.
n Exterior walking tours by the U.S. Capitol Historical Society. 10 a.m. Monday. Meet at the Massachusetts Avenue exit of the Union Station Metro stop. $10. 202/543-8919, Ext. 17.
U.S. Supreme Court
1 First St. NE. Open 9 a.m.-4:30 p.m. Monday-Friday. 202/479-3030.
n Public lectures in the courtroom every half-hour 9:30 a.m.-3:30 p.m. when the court is not hearing arguments. Public seating for arguments when the court is in session is on a first-come, first-served basis on the day the court meets. Call ahead to confirm court meeting location.
Vietnam War and Korean War memorials
Henry Bacon Drive and Daniel French Drive between Constitution and Independence avenues. 8 a.m.-midnight. Metro: Foggy Bottom. 202/426-6841.
16th Street and Constitution Avenue NW. 202/619-PARK. 9 a.m.-5 p.m. Timed tickets are available each day on a first-come, first-served basis at the 15th Street NW kiosk. 800/967-2283.
Washington National Cathedral
Massachusetts and Wisconsin avenues NW. 202/537-6200. 10 a.m.-7:45 p.m. daily, 10 a.m.-4:30 p.m. Saturday. Docent-guided tours 10 a.m.-3:30 p.m. Monday-Saturday, 12:45 p.m.-2:30 p.m. Sunday. No tours on holidays. $3 adults, $1 children.
n Tea tours 1:30 p.m. Tuesday, Wednesday. Call for reservations and fee. 202/537-8993.
The White House
1600 Pennsylvania Ave. NW. 202/456-7041 or 202/456-2322.
n Public tours are available Tuesday through Saturday if they are arranged with a congressional office and if the group has at least 10 persons.
White House Visitor Center
1450 Pennsylvania Ave. NW. 202/208-1631.
n Open 7:30 a.m.-4 p.m. daily.
Washington Photo Safari
n Weekly photo safaris all around the Washington area. Call for schedule. Most tours $69-$119. 877/512-5969 or washingtonphotosafari.com
n Weekly walks in Foggy Bottom, Georgetown, Lafayette Square, other neighborhoods. Call for schedule. Most tours $5-$10. 202/484-1565 or www.washingtonwalks.com.