Zelienople Historical Society will host its 22nd annual Christmas Home Tour on Dec. 6. Area homes decorated in a variety of styles will be opened for guests during the self-drive event that begins at 9 a.m. The $22 ticket price includes the tour and a catered luncheon featuring door prizes. Paid reservations are required in advance. Call 724-452-9457.

Harmony Museum, 218 Mercer St., Harmony, has unveiled its 2014 Christmas season model railroad display and extended indefinitely a Flags of Freedom exhibit. Guided tours that include the 1809 main museum building and wine cellar and a neighboring early 19th century house, both built by the communal Harmony Society, and a Mennonite log house, are offered 1 to 4 p.m. daily except when the museum is closed Mondays and holidays. Admission is $7 for adults, $6 for senior citizens age 60 and older, and $3 for youths ages 6 to 17. Call 724-452-7341.

Carnegie Science Center, next to Heinz Field on the North Side, will show its Miniature Railroad & Village addition, a model of the Buhl Planetarium & Observatory, to the public starting Friday in commemoration of the planetarium’s 75th anniversary year. The Science Center continues the exhibit “Blue!” through Jan. 1. Science center hours are 10 a.m. to 7 p.m. Saturdays and 10 a.m. to 5 p.m. Sundays through Fridays, except the center is typically closed during Steelers home games. General admission is $17.95 for adults and $11.95 for children ages 3 to 12. Call 412-237-3400 or visit CarnegieScienceCenter.org.Heinz History Center, 1212 Smallman St., hosts historian and Pittsburgh native David McCullough for a panel discussion on the importance of America’s river cities at 11 a.m. Tuesday. “Pittsburgh’s Lost Steamboat: Treasures of the Arabia” continues through Jan. 4. An exhibition showcasing the Heinz company also continues. History Center admission is $15 for adults, $13 for senior citizens age 62 and older, and $6 for students and children ages 6 to 17. Call 412-454-6000 or visit www.heinzhistorycenter.org.Phipps Conservatory and Botanical Gardens, 700 Frank Curto Drive, hosts the Winter Flower Show Friday through Jan. 11. Additionally, Phipps and Pittsburgh Ballet Theatre will present Saturdays with the Sugarplum Fairy, 30-minute creative movement classes for children of all ages, at 10:30 a.m. Dec. 6 and 13, free with Phipps admission, which is $15 for adults; $14 for students and seniors; and $11 for children ages 2 to 18.National Aviary, 700 Arch St., presents “Wings in Winter,” daily holiday activities, festive décor and a new, musical free-flight bird show. Wings in Winter runs through Jan. 11. Admission is $14 for adults, $13 for senior citizens age 60 and older and $12 for children ages 2 to 18. Hours are 10 a.m. to 5 p.m. daily; closed Thanksgiving, Christmas Eve and Christmas Day, but open 10 a.m. to 3 p.m. New Year’s Eve. Call 412-323-7235 or visit www.aviary.orgToonSeum, Pittsburgh’s Museum of Cartoon Art at 945 Liberty Ave., presents “When Universes Collide: The Ultimate Superhero Smackdown” through Jan. 4. Museum hours are 10:30 a.m. to 3:30 p.m. Mondays, Wednesdays and Thursdays, 10:30 a.m. to 7 p.m. Fridays, 10:30 a.m. to 5 p.m. Saturdays and 11 a.m. to 5 p.m. Sundays; closed Tuesdays and major holidays. Admission is $6 for those over age 13 and $3 for children ages 6 to 12. Senior citizens, college students, veterans and active military pay $5. Call 412-232-0199 or visit toonseum.org.Children’s Museum, 10 Children’s Way, Allegheny Square, hosts the exhibit “Bounce: Inspired by the World’s Most Amazing Ball!” and the annual Tough Art exhibit. Admission is $14 for adults and $13 for children ages 2 to 18 and senior citizens. Children younger than 2 are admitted free. The museum is open 10 a.m. to 5 p.m. daily, except major holidays such as Thanksgiving. Call 412-322-5058 or visit www.pittsburghkids.org.