A free train show is being shown through Jan. 2 at Thorncreek United Methodist Church, 142 Rockdale Road. Hours are 5 to 8 p.m. Friday and noon to 8 p.m. Saturdays and Sundays. The show will be closed Dec. 24, 25, 31 and Jan. 1. Call 724-352-4890.

<B>Nationality Rooms</B> at the University of Pittsburgh's Cathedral of Learning, 4200 Fifth Ave., are decorated in the styles of their holiday traditions through Jan. 14. Reservations for guided tours are accepted for groups of 10 or more made by prior arrangement for dates after Jan. 2. Tour fees are $3 for adults and $1 for youths ages 8 to 18. Call 412-624-6000.<B>Phipps Conservatory and Botanical Gardens</B>, One Schenley Park, is presenting its winter flower show through Jan. 9. Nine of Phipps indoor gardens will transform to tell the tale of holidays past, present and future with topiary snowmen made of white Alyssum, hanging baskets, evergreens lit with tens of thousands of LED lights, three G scale trains and close to 2,000 poinsettias. Phipps is usually open daily from 9:30 a.m. to 5 p.m. and Fridays until 10 p.m., but during the holidays, Phipps will close at 5 p.m. on Christmas Eve and be closed Christmas Day. Otherwise, candlelight evenings continue through Dec. 31 until 10 p.m. nightly. Admission is $12 for adults; $11 for senior citizens age 62 and older and 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, www.phipps.conservatory.org.<B>Heinz History Center</B>, 1212 Smallman St., hosts the exhibit“Vatican Splendors: A Journey through Faith and Art” containing original works by Michelangelo, Bernini and Giotto in the largest Vatican exhibit ever to visit North America, through Jan. 9. Tickets are $20 for adults, $17 for senior citizens and students with college ID, and $13 for children ages 6 to 13: children age 5 and younger are admitted free. Tickets are available online at www.ticketmaster.com, or by calling 888-588-4226.<B>National Aviary</B>, 700 Arch St., will host a holiday bird show at 11 a.m. and 1:30 p.m. daily through Jan. 2 immediately following “Wings!” in the Helen M. Schmidt FliteZone Theater. Aviary admission is $12 for adults, $11 for senior citizens, $9.50 for children ages 2 to 12, and free for those younger than 2. Winter hours are 10 a.m. to 5 p.m. every day except closed Christmas Eve and Christmas Day. Open New Year's Day. Call 412-323-7235 or visit www.aviary.org.<B>ToonSeum</B>, Pittsburgh's Museum of Cartoon Art at 945 Liberty Ave., hosts “Looney Tunes Treasury” author Andrew Farago from noon to 2 p.m. Sunday to sign copies of his new book on the classic Looney Tunes characters. Regular 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; closed holidays. Museum admission is $4 for adults and $3 for children ages 5 to 17; children younger than 5 are admitted free. Visit www.toonseum.org.<B>Children's Museum</B>, 10 Children's Way, Allegheny Square, continues “Tough Art” through Jan. 16 and “Whoosh!” through May 29. The museum will be closed Christmas Day and New Year's Day. Museum hours are from 10 a.m. to 5 p.m. Mondays to Saturdays; and noon to 5 p.m. Sundays. Admission is $11 for adults; $10 for senior citizens older than 65 and children ages 2 to 18, and free for children younger than 2. Parking is $5 for nonmembers. Call 412-322-5058 or visit www.pittsburghkids.org.<B>Carnegie Science Center, </B>North Side, presents The Miniature Railroad and Village exhibit. Regular science center hours are 10 a.m. to 5 p.m. Sundays through Fridays and 10 a.m. to 7 p.m. Saturdays. Hours will be limited for Steelers' home games and the holidays as follows: closed Christmas Day. The center will close at 4 p.m. today and Friday and Dec. 31, but will remain open until 7 p.m. Sunday and Dec. 30. General admission is $17.95 for adults and $9.95 for children ages 3 to 12. Omnimax films are extra. Call 412-237-3400.