COUNTYHarmony Museum, 218 Mercer St., offers tours from 1 to 4 p.m. daily, except when the museum is closed Mondays. Admission is $7 for adults, $6 for senior citizens, and $3 for youths 6 to 17. Call 724-452-7341.

REGIONOil Creek & Titusville Railroad’s Perry Street Station will be transformed into a World War II encampment Friday through Sunday. On display will be uniforms, weapons and vehicles from the era. Call 814-676-1733 to make train reservations. Additionally, there will be a 1940s-era dance at 7 p.m. Saturday at VFW Post 5958, a block from the station. Admission to the dance is free.

PITTSBURGHNational Aviary, 700 Arch St., presents the Butterfly Garden daily from 11 a.m. to 4 p.m., weather permitting. Aviary admission is $14 for adults and $13 for senior citizens and children 2 to 12. Visit aviary.org.ToonSeum, a museum of cartoon art, 945 Liberty Ave., hosts “Captain America: 75 Years of the Sentinel of Liberty.” Work by editorial cartoonists is on display. Admission is $8 for those 13 and older and $4 for age 6 to 12. Military personnel and veterans receive free admission. Visit toonseum.org.Children’s Museum, Allegheny Square, presents “Daniel Tiger’s Neighborhood: A Grr-ific Exhibit.” Hours are 10 a.m. to 5 p.m. daily. Admission is $14 for adults and $13 for children 2 to 18, and senior citizens. Visit www.pittsburghkids.org.Carnegie Museum of Natural History, 4400 Forbes Ave., Oakland, hosts the “50 Greatest Photographs of National Geographic.” Hours are 10 a.m. to 5 p.m. Mondays and Wednesdays through Saturdays, with hours until 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Admission is $19.95 for adults, $14.95 for senior citizens, and $11.95 for children 3 to 18. Visit www.carnegiemnh.org.