Harmony Museum on Mercer Street in Harmony is showing its expanded Christmas season model railroad display. The antique Yobp-Eckstein log village and O gauge railroad is joined by an HO gauge layout. Also new is a “hands-on” wood push train for preschoolers on a tiny child-level table. Museum hours are 1 to 4 p.m. Tuesdays through Sundays, closed Mondays. Guided tours are available. Reservations are suggested for weekends and required for groups. Call 724-452-7341 or 888-821-4822, or visit www.harmonymuseum.org.

A 28-foot-by-16-foot HO model railroad display will be running from 12:30 p.m. to 5 p.m. Saturdays and Sundays until the end of January at Donaldson Motors, 714 River Ave., Emlenton. Call 724-867-2293.

The Holocaust Center of Pittsburgh and the August Wilson Center have partnered to present “The Nazi Olympics: Berlin 1936” through Feb. 28 at the Wilson Center, 980 Liberty Ave. For tickets, call 412-421-1500, Ext. 106, or visit www.AugustWilsonCenter.org.Phipps Conservatory and Botanical Gardens offers the winter flower show and new winter light garden through Sunday. Holiday hours are 9:30 a.m. to 10 p.m. daily. The light garden shines from 5 to 10 p.m. Admission is $12 for adults, $11 for senior citizens and students with ID, $9 for children ages 2 to 18, and free for members and children younger than 2. Visit phipps.conservatory.org.Heinz History Center, 1212 Smallman St., in addition to its regular hours from 10 a.m. to 5 p.m. daily, will offer extended hours until 8 p.m. through Sunday. Exhibits include “Gridiron Glory: The Best of the Pro Football Hall of Fame,” which concludes Sunday, and “From Slavery to Freedom,” a long-term exhibit highlighting the history of the anti-slavery movement, the Underground Railroad, and the impact of 19th century activism on the modern quest for civil and human rights in Pittsburgh. Admission is $15 for adults, $13 for senior citizens, $10 for students and children ages 6 to 17, and free for children 5 and younger. Call 412-454-6000 or visit www.heinzhistorycenter.org.ToonSeum, Pittsburgh's Museum of Cartoon Art at 945 Liberty Ave., hosts David Leblanc's first solo exhibition “New Action Evolution,” a different kind of super hero exhibit that will feature more than 10 of Leblanc's paintings, through Sunday. Admission is $4 for adults and free for children 12 and younger. 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. Call 412-232-0199 or visit www.toonseum.org.Children's Museum, 10 Children's Way, Allegheny Square, is displaying “Tough Art” through Jan. 13. “Missing Links (The Rainbow Jumpy)” continues through Feb. 3. Hours are 10 a.m. to 5 p.m. daily. Admission is $13 for adults, $12 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.Carnegie Science Center, North Side, presents Spaceplace, a permanent exhibit featuring a two-story walk-in replica of the International Space Station, a model of the Hubble telescope, and a weightlessness experience. Admission is $17.95 for adults and $11.95 for children 3 to 12. Call 412-237-3400 or visit CarnegieScienceCenter.org for information. Hours are 10 a.m. to 7 p.m. Saturdays and 10 a.m. to 5 p.m. Sundays through Fridays.