Butler County Heritage Center, 119 W. New Castle St., celebrating the 150th anniversary of the birth of the oil industry with two exhibits, will be open from noon to 4 p.m. Friday. Admission is $5 for adults, $2 for ages 5 to 17, and free for age 5 and younger. Call 724-283-8116.

Lowrie/Shaw House, 123 W. Diamond St., built in 1828 by Butler's only United States senator, will be open from noon to 4 p.m., with the last tour beginning at 3 p.m. Friday. Admission is $3 for adults, $1 for ages 5 to 17, and free for age 5 and younger. The house museum is located at 123 W. Diamond Street, directly behind the Butler County Courthouse. Call 724-283-8116.

Harmony Museum on Mercer Street in Harmony, is displaying "The First Shot," Deac Mong's painting depicting a "French Indian" firing the first shot of the French and Indian War at young Virginia Maj. George Washington near Harmony in 1753. Regular guided tours are offered from 1 to 4 p.m. daily except Mondays and holidays; reservations are suggested for weekends and required for groups. Call 724-452-7341 or 888-821-4822, or visit the Web site, www.harmonymuseum.org.

<B>National Aviary</B>, 700 Arch St., presents FliteZone at 11:30 a.m. and 2:30 p.m. Wednesdays through Sundays through Labor Day, weather permitting. A birding walk is planned at 10:30 a.m. daily. The new Penguin Point is open. Aviary hours are from 9 a.m. to 5 p.m. daily through Sept 7. Admission is $10 for adults; $9 for senior citizens; $8.50 for children 2 to 12; and free for children younger than 2. Call 412-323-7235 or visit the Web site, www.aviary.org.<B>Pittsburgh Children's Museum</B>, 10 Children's Way, Allegheny Square, is hosting "Bob the Builder - Project: Build It" through Sept. 27. House Week, when visitors can build a birdhouse, doghouse or temporary shelter, continues through Sunday. Museum hours are 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 and children ages 2 to 18, and free for children younger than 2. Call 412-322-5058 or visit the Web site, www.pittsburghkids.org.<B>Heinz History Center</B>, 1212 Smallman St., is featuring "Forbes Field: A Century of Memories" commemorating the 100th anniversary of one of America's most famous ballparks, plus "Lincoln: The Constitution and the Civil War and Lincoln Slept Here." Center hours are 10 a.m. to 5 p.m. daily, except holidays. Admission is $10 for adults, $9 for senior citizens age 62 and older, $5 for students with ID and for children ages 4 to 17, and free for children 3 and younger. Call 412-454-6000.