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 children ages 5 to 17, and free for those younger than 5. 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. Fridays, with the last tour beginning at 3 p.m., during August. 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, offers regular guided tours 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>Pittsburgh Children's Museum</B>, 10 Children's Way, Allegheny Square, will present a construction site obstacle course from 1 to 4 p.m. Saturday and Sunday to go along with the "Bob the Builder — Project: Build It" exhibit, which continues through Sept. 27. Regular 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>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 ages 2 to 12; and free for children younger than 2. Call 412-323-7235 or visit the Web site, www.aviary.org.<B>Heinz History Center</B>, 1212 Smallman St., recently opened "Behind the Scenes with the Pittsburgh Steelers: Photographs by Mike Fabus," including a special exhibit of all six Steelers' Super Bowl Trophies. The trophies will be displayed through Sunday. The photographic exhibit will run through January. History 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.<B>Phipps Conservatory and Botanical Gardens</B> in Schenley Park continues "Life in the Gardens: Fräbel Glass at Phipps" through January. This exhibit features the imaginative artistry of German-born artist Hans Godo Fräbel, a founding father of modern glass sculpture. Phipps is open daily from 9:30 a.m. to 5 p.m. and until 10 p.m. on Fridays. Admission rates are $10 for adults, $9 for seniors age 62 and older and students with ID, and $7 for children ages 2 to 18. Phipps members and children younger than 2 are admitted free. Call 412-622-6914 or visit www.phipps.conservatory.org.<B>Carnegie Museum of Natural History</B>, 4400 Forbes Ave. in Oakland, continues "Dinosaurs in Their Time." Hours are 10 a.m. to 5 p.m. Tuesdays through Saturdays, with additional hours until 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Closed major holidays. Regular admission, which includes the Carnegie Museum of Art, is $15 for adults, $12 for senior citizens, and $11 for students and children age 3 and older, and free for members and children younger than 3. Call 412-622-3131 or visit the Web site, www.carnegiemnh.org.