What's Doing For the Holidays MOUNT VERNON -- The former home of George Washington is open from 9 to 4 daily. Regular tours of the mansion, decorated for the holidays, are held through Jan. 6. Adults $9, seniors $8.50, ages 6 through 11 $4.50, under 6 free. At the south end of the George Washington Parkway, eight miles south of Alexandria. 703-780-2000.

CEDAR HILL -- Open from 9 to 4 daily (closed Wednesday), through Dec. 31. Visit the the home of Frederick Douglass, decorated with Victorian trimmings. Candlelight tours, Friday at 5, 6 and 7 p.m.; reservations recommended. 1411 W St. SE. 202-426-5961.

OATLANDS PLANTATION -- Open 10 to 4 weekdays and Saturdays, 1 to 4:30 Sundays through Dec. 30. Visit the historic 19th-century plantation, decorated for the holidays. $8, $7 for seniors and students, $1 for ages 5 to 11 (younger free). Candlelight tours of the mansion, Saturday night from 5:30 to 8:30; $10, $3 for children 7 and younger. On U.S. 15 six miles south of Leesburg. 703-777-3174.

U.S. BOTANIC GARDEN Conservatory -- Open 10 to 5 daily, through Jan. 5. Conservatory offers a fantasy land with a Chocolate Chunk Mountain, Cotton Candy Corner, Candy Cane Forest, a model train display, holiday greenery and more. 100 Maryland Ave. SW. 202-225-8333.

HEURICH HOUSE Museum -- Open Friday 10 to 4. $3, $1.50 seniors and students. The Victorian home welcomes visitors with traditional decorations. Candlelight tours Friday from 6 to 8; $10, $5 for seniors and students, children 11 and younger free. Reservations required for the candlelight tours. 1307 New Hampshire Ave. NW. 202-785-2068, Ext. 100.

"PAGEANT OF PEACE" -- Open 10 a.m. to 11 p.m. daily through Jan. 1. The National Christmas Tree and trees representing every state and territory are on display. Musical entertainment nightly from 6 to 8:30 weekdays, 4 to 8:30 weekends Dec. 6-30 (no performances on Tuesday or Wednesday). On the Ellipse, at 15th and Constitution NW. Call 202-208-1631.

HOLIDAY TOURS -- Open noon to 4 daily, except Mondays, through Jan. 5. Beall-Dawson House, 103 W. Montgomery Ave., Rockville, $3, $2 seniors and students, free for ages 5 and younger. 301-762-1492.

"GARDEN OF LIGHTS" -- Open nightly except Tuesday, Wednesday and New Year's Eve from 5:30 to 8:30. Take a half-mile walk through a display of twinkling flower light forms. Brookside Gardens, Wheaton. Admission is $15 per car or van on Fridays, Saturdays and Sundays, $10 on other days. Call 301-962-1453.

"MIRACLE OF LIGHTS" -- Open nightly 5:30 to 10:30, except New Year's Eve, through Jan. 4. Tour a holiday light show that benefits the Healthy Families Fairfax program. $12 per vehicle with up to 14 passengers. Bull Run Regional Park, 7700 Bull Run Dr., Centreville. 703-709-5437.

"SYMPHONY OF LIGHTS" -- Open nightly from 6 to 11 through Jan. 5. Tour more than 70 holiday light creations at Howard County General Hospital's annual fundraiser. $12 per vehicle with up to 11 passengers. In Symphony Woods, on Little Patuxent Parkway off U.S. 29, Columbia. 410-740-7666.

"FESTIVAL OF LIGHTS" -- Open nightly through Jan. 5 from 5 to 9:30. Tour a 2.5-mile drive-through route of holiday lighting displays. $5 per car or van. Free on Wednesday. Canned goods accepted nightly for donation to local food banks. Watkins Regional Park, 301 Watkins Park Dr., Upper Marlboro. 301-699-2456 (TDD: 301-454-1493).

"WINTER LIGHTS FESTIVAL" -- Open Fridays and Saturdays from 6 to 10 p.m., Sundays through Thursdays from 6 to 9, through Dec. 31 (closed Wednesday). Take a 3.5-mile drive through an enchanted forest setting. $10 per car. Seneca Creek State Park, 11950 Clopper Rd., Gaithersburg. 301-258-6350.

"FESTIVAL OF LIGHTS" -- Open nightly 5:30 to 10 through Jan. 1. Tour light displays and decorated trees; nightly concerts at 7 and 8. Washington Temple Visitors Center, 9900 Stoneybrook Dr., Kensington. 301-587-0144.

BLACK GIFT & ART SHOW -- Saturday 10 to 6. About 100 vendors. $2. Shiloh Family Life Center, Ninth and P streets NW. 202-575-2879.

GLENVIEW MANSION Open House -- Sunday from 1 to 4. Civic Center Park, 603 Edmonston Dr., Rockville. 240-314-8660.

WOODLAWN PLANTATION -- Sundays through Dec. 29; tours begin between 5:30 to 8. See how the holidays were celebrated during the Federal period. $15, $5 for children through age 18. 9000 Richmond Hwy., Mount Vernon. 703-780-4000, Ext. 27.

"HOUSES OF WORSHIP TOUR" -- Thursday 4 to 9, self-guided candlelight tour of 15 historic churches and synagogues in Frederick; obtain map and brochure at Frederick Visitors Center, 19 E. Church St.. 301-228-2888 or 800-999-3613.

"WINTER AT RIVERSDALE" -- Thursday and Dec. 27 from 7 to 9 p.m., music, costumed interpreters, refreshments. $5, under 12 free. Riversdale House Museum, 4811 Riverdale Road, Riverdale Park. 301-864-0420.