Museums

HILLWOOD The former home of Marjorie Merriweather Post displays her collection of Russian and French decorative art and maintains 13 acres of formal gardens. Open Tuesday-Saturday 10 to 5. $12, seniors $10, students $7, ages 6 to 18 $5. 4155 Linnean Ave. NW. 202-686-5807.

HIRSHHORN"Directions -- Amy Sillman: Third Person Singular," through July 6; "The Cinema Effect: Illusion, Reality and the Moving Image, Part II: Realisms," through Sept. 7. Exhibits of 19th- and 20th-century paintings and sculpture, and an outdoor sculpture garden. Open daily 10 to 5:30. Seventh and Independence SW. 202-633-1000 (TDD: 202-633-5285).

HISTORICAL SOCIETY OF WASHINGTON"Discover Greatness: An Illustrated History of Negro Baseball Leagues," through Oct. 5; "Separate and Unequaled: Black Baseball in the District of Columbia," through Oct. 5. 801 K St. NW. 202-383-1850.

INTERIOR DEPARTMENT MUSEUM Open indefinitely: "Conservation in Action: The Legacy of Rachel Carson"; "Portraits of Archaeology"; "The Bats and the Bees: Pollination Systems in America"; "The Surveying and Mapping of America." Open weekdays except federal holidays 8:30 to 4:30, and from 1 to 4 on the third Saturday monthly. Free; photo ID required. 18th and C NW. 202-208-4743.

INTERNATIONAL SPY MUSEUM Displays of wristwatch cameras, poison gas guns, a World War II Enigma cipher machine and other coding machines, disguises, etc. Open daily 10 to 6. $18, seniors $17, ages 5 to 11 $15, younger free. Separate admission to "Operation Spy," $14 for age 12 and older; combination ticket $25. 800 F St. NW. 202-393-7798.

KOSHLAND SCIENCE MUSEUM Open indefinitely: "Global Warming Facts & Our Future"; "Infectious Disease: Evolving Challenges to Human Health"; "Wonders of Science." Open daily except Tuesdays 10 to 5. $5, seniors, students and military $3. Sixth and E NW. 202-334-1201.

KREEGER MUSEUM"Philip Johnson: Architecture as Art," through July 31. The Philip Johnson-designed former residence of Carmen and David Kreeger displays its collection of 19th- and 20th-century paintings and sculpture, and traditional African art. Open Saturday 10 to 4; guided tours by reservation only Tuesday-Friday at 10:30 and 1:30. $10, seniors and students $7 ( through July 31). 2401 Foxhall Rd. NW. 202-338-3552.

LIBRARY OF CONGRESS"Alvin Ailey American Dance Theater: 50 Years as Cultural Ambassador to the World," through Sept. 6. Open indefinitely: "Bob Hope and American Variety"; "Exploring the Early Americas"; "The Library of Congress Experience," interactive displays and kiosks. Tour the Thomas Jefferson Building hourly 10:30 to 3:30 Monday-Friday and 10:30 to 2:30 Saturdays; Open Monday-Saturday 10 to 5. 10 First St. SE. 202-707-4604.

LOUDOUN MUSEUM Collection of Indian, Revolutionary War, Civil War and local history objects. Open Friday-Saturday 10 to 5, Sunday 1 to 5, Monday and Wednesday-Thursday 10 to 5. $3, students, teachers and seniors $1, age 4 and younger free. 16 Loudoun St. SW, Leesburg. 703-777-7427.

MADAME TUSSAUDS Collection of wax figures of celebrities and historical figures. Open daily 10 to 6. $18, seniors $15, age 4 to 12 $12, younger free. 1025 F St. NW. 888-929-4632.

MANASSAS MUSEUM The collection comprises memorabilia of the Virginia Piedmont, the Civil War and Reconstruction, and the early years of Manassas. Open Tuesday-Sunday 10 to 5. $3, seniors, students and teachers $1, ages 4 and younger free. 9101 Prince William St., Manassas. 703-330-2787.

MARINE CORPS Multimedia exhibitions about the history of the U.S. Marine Corps and its role in the history of the United States, including re-creations of a Korean War battlefield and a Vietnam combat zone, indefinitely. Open daily 9 to 5. 18900 Jefferson Davis Hwy., Triangle. 877-653-1775.