A train runs through the Miniature Railroad and Village freshly open for the season at the Carnegie Science Center.

Old Economy Village in Ambridge presents its annual Christmas at the Village on Saturday and Sunday, with buildings decorated to represent vignettes of Grimm's fairy tales. Hours are 2 to 9 p.m. Saturday and 2 to 7 p.m. Sunday. Admission is $12 for adults, $6 for children ages 3 to 11, and free for children younger than 3. Call 724-266-4500, or visit the website www.oldeconomyvillage.org.

<B>Phipps Conservatory and Botanical Gardens</B> presents its traditional winter flower show themed this year around “The Nutcracker, A Fresh Arrangement” through Jan. 8. Poinsettias, amaryllis and ivy along with twinkling lights and aromatic greens will deck the halls. Cut trees will be decorated to symbolize the different dances of the “The Nutcracker” ballet. Visits with Santa are planned for Saturdays and Sundays through Dec. 18. The conservatory at One Schenley Park is open daily from 9:30 a.m. to 5 p.m. and until 10 p.m. from Dec. 5 to 31 for candlelight evenings. Admission is $12 for adults, $11 for senior citizens and for students with valid ID, $9 for children ages 2 to 18, and free for children younger than 2. Call 412-622-6914 or visit the website http://phipps.conservatory.org.<B>Heinz History Center</B>, 1212 Smallman St., will host holiday tours of the “Stars and Stripes” exhibit at 11 a.m., noon and 1 p.m. Saturday and Dec. 17. Admission is $10 for adults, $9 for senior citizens, $5 for students with ID and for children ages 4 to 17, and free for children 3 and younger. Hours are 10 a.m. to 5 p.m. daily. Call 412-454-6000 or visit www.heinzhistorycenter.org.<B>Carnegie Science Center,</B> North Side, hosts Locomotion Weekend on Saturday and Sunday for train enthusiasts of all ages. A train-related Breakfast Express is available at 9 a.m. Saturday and Dec. 17. The Miniature Railroad and Village is open for the season, and the new laser show “Holiday Magic” runs through Jan. 8. Hours are 10 a.m. to 7 p.m. Saturdays and 10 a.m. to 5 p.m. Sundays through Fridays. Admission is $17.95 for adults and $11.95 for children ages 3 to 12. Some activities cost extra. Call 412-237-3400. The science center will be closed at 4 p.m. today for the Steelers game.<B>National Aviary</B>, 700 Arch St., hosts breakfast with Santa at 8:30 a.m. Saturday and Dec. 17, “Photo Safari: Tropical Rainforest” from 9 to 10 a.m. Saturday, “Penguins Camp” for children ages 6 to 8 from 9 a.m. to 3 p.m. Dec. 29 and for children ages 9 to 12 on Dec. 30, and the holiday bird show, starring Fleury the snowy owl, daily at noon and 3 p.m. through Jan. 2. Extra fees apply for these programs. General admission is $13 for adults, $12 for senior citizens, $11 for children ages 2 to 12, and free for children younger than 2. For reservations, call 412-323-7235 or visit www.aviary.org.<B>Children’s Museum</B>, 10 Children’s Way, Allegheny Square, presents “How People Make Things” through Feb. 5, and “Tough Art” through Jan. 16. Museum hours are 10 a.m. to 5 p.m. Mondays to Saturdays and noon to 5 p.m. Sundays. Admission is $12 for adults, $11 for children ages 2 to 18 and senior citizens, and free for children younger than 2. Call 412-322-5058 or visit www.pittsburghkids.org.<B>ToonSeum</B>, Pittsburgh’s Museum of Cartoon Art at 945 Liberty Ave., presents “Overture: Looney Tunes Behind the Scenes” featuring artists from “Looney Tunes” director and animator Robert McKimson to animator Sam Nicholson, known for his skill as a caricaturist, through Dec. 31. Museum hours are 10 a.m. to 3 p.m. Wednesdays and Thursdays, 10 a.m. to 5 p.m. Fridays and Saturdays and 11 a.m. to 4 p.m. Sundays. Admission is $4 for adults and $3 for children ages 5 to 17. Visit www.toonseum.org or call 412-232-0199.