This exterior shot of Forbes Field is among photographs on display at the Senator John Heinz History Center in Pittsburgh to mark the 100th anniversary of the famous ballfield.

Cooper Cabin Pioneer Homestead, 199 Cooper Road, Cabot, will be open from 1 to 4 p.m. Sunday 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. Ryan Stauffer will demonstrate what it was like to be a blacksmith in pioneer days. Admission is $3 for adults, $2 for youths ages 5 to 17 and senior citizens, and free for children younger than 5 and Butler County Historical Society members. Call 724-283-8116.

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 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 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 age 5 and younger. The house museum is located at 123 West Diamond Street, 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 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., presents FliteZone, the aviary's outdoor free-flight bird show, included with admission. 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 ages 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 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 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. Fridays. Admission is $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>Carnegie Science Center</B>, One Allegheny Ave., North Side, is open 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 Constructor's Corner: Sheet Metal Work from 1 to 3 p.m. Friday. "Superhero Sunday!" will take place from noon to 4 p.m. Sunday. "Bob the Builder ¿ Project: Build It" continues through Sept. 27. 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>Carnegie Museum of Natural History</B>, 4400 Forbes Ave., 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. 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.