Ongoing

OATLANDS PLANTATION -- The historic 19th-century plantation will be adorned with decorations from Europe through Dec. 30 from 10 to 4 weekdays and Saturdays, 1 to 4:30 Sundays. $8, $7 seniors and students ages 12 through 18, $1 ages 5-11 (younger free). Candlelight tours of the mansion are also offered Saturday nights though Dec. 21 from 5:30 to 8:30. $10, $3 children 7 and younger. Oatlands is on U.S. 15 six miles south of Leesburg. 703-777-3174.

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

Friday

MOUNT VERNON candlelight tours are held Fridays, Saturdays and Sundays through Dec. 15 from 5 to 8. Candlelight tour tickets are $15, $8 children 11 and younger. Advance purchase recommended. Regular tours of the mansion, decorated for the holidays, are held Sunday through Jan. 6. The estate is open from 9 to 4 daily, including Christmas and New Year's. 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.

Sunday CEDAR HILL, the home of Frederick Douglass, will be decorated with Victorian trimmings through Dec. 31. Hours are 9 to 4 daily (closed Christmas day). Candlelight tour dates and times TBA. 1411 W St. SE. 202-426-5961.

GLENVIEW MANSION holds holiday open houses on Sundays through Dec. 22 from 1 to 4. Musical performances on Sunday and Dec. 8. Special activities for children on Dec. 15. Civic Center Park, 603 Edmonston Dr., Rockville. 240-314-8660.

Monday

HEURICH HOUSE Museum -- The Victorian home welcomes visitors with traditional decorations Monday through Dec. 20 from 10 to 4. $3, $1.50 seniors and students. Candlelight tours are held Dec. 12, Dec. 13, Dec. 19 and Dec. 20 from 6 to 8. Those tickets are $10, $5 seniors and students (children 11 and younger free). Reservations required for the candlelight tours. 1307 New Hampshire Ave. NW. 202-785-2068, Ext. 100.

Wednesday

DAR CHRISTMAS Open House -- Choral music, tours and a tree lighting (at 6) plus hot chocolate and cookies Wednesday from 5:30 to 7:30 at DAR Constitution Hall, 17th and D streets NW. 202-572-0563.

SULLY PLANTATION -- See historic Sully decorated in Victorian splendor, Wednesday through Dec. 30 from 11 to 4. $5, $4 students, $3 seniors and children. Candlelight tours will be held Dec. 13-14 from 4:30 (last tour at 7:15). $7, $5 seniors and children. Prepaid reservations required for the candlelight tours. On Route 28 one-half mile north of U.S. 50 in Chantilly. 703-437-1794.

Thursday

HILLWOOD MUSEUM and garden offers a "Holidays at Hillwood" tour Thursday and Dec. 12 and Dec. 19 from 9:30 to 12:15 and 2 to 4:45, with demonstrations of floral decorating from 12:30 to 1:45. $10, children under 18 $5 (children 6 and younger not permitted in the mansion). 4155 Linnean Ave. NW. 202-686-8500.

Dec. 6

GUNSTON HALL Plantation celebrates the holidays with a "Plantation Christmas," with costumed characters, carriage rides and thousands of lights, Dec. 6-7 from 7 p.m. to 10 p.m. Admission is $9, $4 ages 6 through 18 (younger free). A Christmas Tea and Holiday Tour is held Dec. 8 from noon to 2 and 3 to 5 and Dec. 15 from noon to 2. $22, $11 ages 6 to 10 (younger free). Reservations required; call 703-339-0460. Candlelight Mansion Tours and Garden Illuminations are held Dec. 12-13 from 5 p.m. to 8 p.m. $7, $6 seniors, $3 ages 6 through 18 (younger free). 10709 Gunston Rd. Mason Neck. 703-550-9220.

Dec. 7

HERNDON HOMES Tour -- Tour area homes with holiday floral designs, Dec. 7 from 11 to 5. Tour begins at the Herndon Depot Museum, 717 Lynn St., Herndon. $10. 703-437-7289.

THE LYCEUM hosts "A Dickens of a Christmas Party" on Dec. 7 from 2 to 4 at the Lyceum, 201 S. Washington St., Alexandria. Activities include a reading of "The Christmas Carol," games, ornament making, tree trimming, music and refreshments. $3; reservations recommended. 703-838-4994.

BELAIR MANSION -- Candlelight tours Dec. 7-8 from 4 to 7. $3. Holiday High Tea and Tour on Dec. 12 and Dec. 28 at 4. $17; reservations required. A Colonial Christmas for Kids, with crafts and refreshments, is held Dec. 14 at 10 a.m. for children ages 6 through 10. $7; advance reservations and payment required. 12207 Tulip Grove Dr., Bowie. 301-809-3089.

FREDERICK HOUSE TOUR -- Tour seven homes decorated for the holidays on Dec. 7 from 5:30 to 9:30 and Dec. 8 from noon to 4. 301-694-2489 for details.

NATIONAL COLONIAL Farm holds a Winter's Eve celebration Dec. 7 from 5 to 8 p.m. with carols, a bonfire, tours of a decorated farmhouse, hot cider and more. 3400 Bryan Point Rd., Accokeek, Md. 301-283-2113.

Dec. 8

BOWIE TRAIN Station Museum -- A free Holiday Open House is held Dec. 8 from noon to 4 at the museum at 8614 Chestnut Ave., Bowie. 301-809-3089.

RADIO AND TELEVISION Museum hosts a free Holiday Open House on Dec. 8 from 1 to 4 at the museum at 2608 Mitchellville Rd., Bowie. 301-390-1020.

SMALLWOOD RETREAT HOUSE -- Candlelight tours in a home decorated in the fashion of the 18th century on Dec. 8 from 1 to 7 at Smallwood State Park, 6075 Manor Lane, La Plata, Md. 301-743-7613.

CHERRY HILL Farmhouse holds a candlelight open house on Dec. 8 from 4:30 to 6:30. $2. 312 Park Ave., Falls Church. 703-248-5171.

TUDOR PLACE holds an open house with special Christmas exhibitions, children's activities, music and refreshments on Dec. 8 and Dec. 15 from 5 to 8 p.m. $10, $3 children 6 through 18. 1644 31st St. NW. 202-965-0400.

Dec. 12 DUMBARTON HOUSE hosts a holiday open house with music, treats and yule decorations on Dec. 12 from 5:30 to 7:30. $10, $4 for children 6-12 (younger free). 2715 Q St. NW. 202-337-2288.

Dec. 14

FREDERICKSBURG hosts a Christmas Candlelight Tour of 10 historic homes on Dec. 14 from 11 to 5, Dec. 15 from 11 to 8. Tour tickets available at the Fredericksburg Area Visitor Center, 706 Caroline St. Tickets are $18 in advance, $24 on tour days. 800-678-4748, 540-373-1776.

CHRISTMAS HOMES TOUR -- Tour five decorated homes during the Christmas Heritage Homes Tour in Strasburg, Va., on Dec. 14 from noon to 5. $10. Call 540-465-8793 for ticket sale locations.

AGRICULTURAL HISTORY Farm Park, 18400 Muncaster Rd., Derwood, holds a Christmas on the Farm Festival on Dec. 14-15 from noon to 8 with hayrides, music, carols and refreshments. Hayrides are $5 for ages 3 and up and prepaid reservations are required; call 301-670-4661.

MORVEN PARK holds special holiday tours Dec. 14-22 at noon, 1, 2, 3 and 4. $7, $6 seniors, $1 children. 17263 Southern Planter Lane, Leesburg. 703-777-2414.

FORT WARD MUSEUM holds a Civil War Christmas Open House on Dec. 14 from noon to 4. Reenactors will show how the holidays were celebrated during the Civil War. $2, $1 children. 4301 W. Braddock Rd., Alexandria. 703-838-4848.

WALNEY FARM demonstrates how the holidays were celebrated during the 1800s on Dec. 14 from 1 to 2. Free, but reservations required. 5040 Walney Rd., Chantilly. 703-631-0013.

FREDERICK MUSEUMS Candlelight Open House -- Tour 20 historic sites in Frederick on Dec. 14 from 2 to 7. Free; get a tour map at the Frederick Visitor Center, 19 E. Church St. 301-228-2888 or 800-999-3613.

COLVIN RUN MILL hosts a Country Christmas celebration with crafts, caroling and roasting marshmallows on Dec. 14 from 4 to 7. 10017 Colvin Run Rd., Great Falls. $5, $4 seniors, $2 children 3 and older. 703-759-2771.

SURRATT HOUSE MUSEUM presents a Victorian yuletide by candlelight Dec. 14-15 from 5 to 9 and Dec. 16 from 6 to 9. $3, $2 seniors, $1 children 5-18. 9118 Brandywine Rd., Clinton. 301-868-1121 (voice and TDD).

Dec. 15

CAPITOL HILL Open Houses -- Six Capitol Hill homes are open for the holidays with music, art and food Dec. 15 from 2 to 6. $25, $5 children 13 and younger. Tickets available from the Capitol Hill Arts Workshop, 545 Seventh St. SE. 202-547-6839.

WOODLAWN PLANTATION celebrates the holidays in the style of the Federal period Dec. 15, Dec. 22 and Dec. 29 with tours from 5:30 (last tour is at 8). $15, $5 children through age 18. 9000 Richmond Hwy., Mount Vernon. For reservations, call 703-780-4000, Ext. 27.

Dec. 26

RIVERSDALE HOUSE Museum holds a holiday celebration with refreshments, live music and children's activities, Dec. 26-27 from 7 to 9 p.m. $5, children 12 and younger free. 4811 Riverdale Rd., Riverdale. 301-864-0420.

The historic Oatlands Manor will decorate for the holidays and open for tours, including some by candlelight.