Old Stone House will be the site of tours from 10 a.m. to 5 p.m. Saturdays and noon to 5 p.m. Sundays through October. Halloween and perhaps Christmas events will be planned. Admission is free but donations are accepted for operation of the historical site. The house at the intersection of Routes 8, 173 and 528, 12 miles north of Butler, is owned and operated by Slippery Rock University. Call 724-738-4964 to confirm hours or make reservations for private tours.

<B>National Aviary</B>, 700 Arch St., will host Owl-O-Ween from 10 a.m. to 1 p.m. Saturdays in October, featuring Halloween treat bags, candy, crafts and plenty of interactive activities with the aviary's birds. There will be free admission on Oct. 31 for kids in costume. FliteZone moves inside for a new show running from 11 a.m. to 1:30 p.m. Wednesdays through Sundays beginning this Saturday. Flamingos have been added to the spectacle. Hours are 10 a.m. to 5 p.m. daily except Christmas Day. Regular admission is $9 for adults; $8 for senior citizens; $7.50 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., in celebration of Pittsburgh's 250th birthday is displaying "Pittsburgh At 250," honoring our region's historic anniversary celebrations in 1858, 1908, 1958 and 2008. Each section includes artifacts and documents from the anniversary celebration set against a panoramic view of the city from that time period. Featured artifacts include commemorative medals and souvenirs, as well as books, programs and special publications. The display will continue through early 2009. 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 ages 6 to 18, and free for children younger than 6. Call 412-454-6000.<B>Carnegie Museum of Natural History</B>, 4400 Forbes Ave. in Oakland, is exhibiting "Born of Fire: The Life and Pottery of Margaret Tafoya" through Jan. 4. The first East Coast exhibit of the works of this master Pueblo potter "Born of Fire" features more than 75 pieces created by Tafoya, with additional works by her mother and descendants, including rare early works from the Santa Clara Pueblo where she lived. Tafoya was one of the last surviving Pueblo matriarchs of the early 20th century. Admission is $15 for adults, $12 for senior citizens, $11 for children ages 3 to 18 and full-time students with ID, and free to children younger than 3 and Carnegie Museums members. Hours are 10 a.m. to 5 p.m. Tuesdays through Saturdays, 10 a.m. to 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Call 412-622-3131 or visit the Web site, www.carnegiemnh.org.