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. Fridays during June. Admission is $5 for adults, $2 for children 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 in June from noon to 4 p.m. Wednesdays and Fridays with the last tour beginning at 3 p.m. Admission is $3 for adults, $1 for ages 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.

Cooper Cabin Pioneer Homestead, 199 Cooper Road, Cabot, will be open from 1 to 4 p.m. June 28 for a program and docent-led tours of the cabin and grounds. The cabin was built circa 1810 by the Cooper family and was home to their descendants until 1963. The property includes the cabin, a spinning house, a springhouse and an herb garden cared for by the Herbal Thymes Garden Club and the Master Gardeners. This Sunday's program will feature Quilt Day activities. On June 28, Ryan Stauffer will demonstrate what it was like to be a blacksmith in pioneer days. Admission is $3 for adults, $2 for youths 5 to 17 and senior citizens, and free for children younger than 5 and Butler County Historical Society members. 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>National Aviary</B>, 700 Arch St., will host a summer solstice party from 11 a.m. to 2 p.m. Saturday. FliteZone, the Aviary's outdoor free-flight bird show, is included with admission. On Sunday for Father's Day, admission for fathers and grandfathers is free. Visitors can also see the penguins in their new arena, Penguin Point. The aviary is open daily through Sept 7 from 9 a.m. to 5 p.m. Admission is $10 for adults; $9 for senior citizens; $8.50 for children 2 to 12; and free for children younger than 2. Visit the Web site, www.aviary.org.<B>Phipps Conservatory and Botanical Gardens</B> in Schenley Park through Oct. 28 will host its first farmers market held from 2:30 to 6:30 p.m. Wednesdays on the lawn. About 20 vendors will feature local, certified organic and Certified Naturally Grown products including vegetables, meats, cheeses, eggs, bread, seedlings, honey, cut flowers, soap and perennials. Continuing is the new exhibition, "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 2 to 18. Phipps members and children under 2 are admitted free. Call 412-622-6914 or visit www.phipps.conservatory.org.<B>Carnegie Science Center</B>, One Allegheny Ave., North Side, celebrates the summer solstice on Sunday with free admission to those who saved a snowball for the occasion. Visitors will have the opportunity to launch their snowballs into the Ohio River via a giant slingshot or air cannon from aboard the USS Requin submarine. The new exhibit "roboworld" is open. Hours are 10 a.m. to 7 p.m. Fridays and Saturdays and from 10 a.m. to 5 p.m. Sundays through Thursdays; closed holidays. Regular admission is $14 for adults and $10 for senior citizens age 62 and older and children 3 to 12. Parking is $3. Call 412-237-3400 or visit the Web site, www.carnegiesciencecenter.org.<B>Pittsburgh Children's Museum</B>, 10 Children's Way, Allegheny Square, is hosting "Old-Fashioned Wooden Toys" from 1 to 4 p.m. Sunday. The Real Truck Series will be from 10 a.m. to 3 p.m. June 25. Constructor's Corner: Sheet Metal Work will be held from 1 to 3 p.m. June 26. "Bob the Builder – Project: Build It" continues through Sept. 27. Regular hours are 10 a.m. to 5 p.m. Mondays to Saturdays; and noon to 5 p.m. Sundays. Admission is $10 for children 2 to 18 and senior citizens and $11 for adults; children younger than 2 are admitted free. Parking is $5 for nonmembers in the museum's lots. 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. "Tours" of Ancient Egypt are available in the Earth Theater. 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 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 "Lincoln: The Constitution and the Civil War and Lincoln Slept Here" through January. 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 age 4 to 17, and free for children 3 and younger. Call 412-454-6000.