Butler County Heritage Center, 119 W. New Castle St., celebrating the 150th anniversary of the birth of the oil industry with two new exhibits, will be open Wednesdays and Fridays from noon until 4 p.m. during the month of May. Admission is $5 for adults, $2 for children ages 5 to 17, and free for those 5 and younger. The Heritage Center is owned and operated by the Butler County Historical Society. Call 724-283-8116.

Lowrie/Shaw House, built in 1828 by Butler's only United States senator, will be open during May on Wednesdays and Fridays from noon until 4 p.m., with the last tour beginning at 3 p.m. Admission is $3 for adults, $1 for children 5 to 17, and free for those 5 and younger. The house museum is at 123 W. Diamond St., directly behind the Butler County Courthouse. Call 724-283-8116 or visit the Web site, www.butlerhistory.com.

Harmony Museum on Mercer Street in Harmony, will host a spring time Victorian tea presented by the Harmony Business Association at 12:30 p.m. Saturday in Stewart Hall at Main and Mercer streets. Admission is $20, and reservations are required. Call 724-452-6220. Those attending are to wear their own Victorian hat or borrow one on arrival.

<B>Phipps Conservatory and Botanical Gardens</B> in Schenley Park opens a new exhibition, "Life in the Gardens: Fräbel Glass at Phipps" on Wednesday. This exhibit features the 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 under 2 are admitted free. Call 412-622-6914 or visit www.phipps.conservatory.org.<B>Pittsburgh Children's Museum</B>, 10 Children's Way, Allegheny Square, concludes the traveling exhibit "Exploring Trees Inside and Out" on Sunday. Regular museum hours are 10 a.m. to 5 p.m. Mondays to Saturdays; and noon to 5 p.m. Sundays. Admission is $9 for children 2 to 18 and senior citizens and $10 for adults; children younger than 2 are admitted free. Call 412-322-5058 or visit the Web site, www.pittsburghkids.org.<B>Carnegie Museum of Natural History</B>, 4400 Forbes Ave. in Oakland, has extended "The Horse" exhibition's run through July 5. Continuing is "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, such as Memorial Day and Fourth of July. 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.<B>Heinz History Center</B>, 1212 Smallman St., features "Pittsburgh: A Tradition of Innovation," tracing Western Pennsylvania's imprint on the world. Hours are 10 a.m. to 5 p.m. daily, except holidays. Admission is $9 for adults, $7 for senior citizens older than 61, $5 for students with ID and for children 6 to 18, and free for children younger than 6. Call 412-454-6000.