Butler County Heritage Center, 119 W. New Castle St., with the new exhibit of the Jay Bee Miniature Circus, will be open from noon to 4 p.m. Wednesdays and 9 a.m. to noon Fridays from May through August, excluding legal holidays. Admission is $3 for adults, $1 for children ages 5 to 17, and free for children younger than 5. Call 724-283-8116.

Lowrie-Shaw House, built in 1828 by Walter Lowrie, Butler's only United States senator, at 123 W. Diamond St., will be open May through September from noon to 4 p.m. Mondays, Wednesdays and Fridays, except legal holidays. Admission is $3 for adults, $1 for children ages 5 to 17, and free for children younger than 5. Call 724-283-8116.

The Little Red Schoolhouse on East Jefferson Street directly behind Butler Junior High School can be toured in May by appointment. Admission to each site is $3 for adults, $1 for youth ages 5 to 17, and free for children younger than 5. The site will also be open during Cruisa-Palooza in June and Butler's Fall Festival in September. Call 724-283-8116.

<B>National Aviary</B>, 700 Arch St., hosts jazz musicians Anthony Braxton and the Syrinx Ensemble playing music inspired by the sounds of nature at 10 a.m. Saturday and Sunday. The concerts are free with Aviary admission and will take place in the National Aviary's free-flight exhibits. Little Peepers, the Aviary's popular story-time program, will take place at 10:30 a.m. Mondays. Two-Fur-Tuesdays offered two-for-one admission on Tuesdays through Aug. 26. Summer hours are now in effect and are 9 a.m. to 5 p.m. daily through Sept. 1. Free admission for dads will be offered on Father's Day, June 19. 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.has begun a freeflight bird show called FliteZone. Green-winged and scarlet macaws, birds of prey, talkative parrots and a flock of other feathered friends will be wing their way over the Aviary's Rose Garden from Saturday through Labor Day at 11:30 a.m. and 2:30 p.m. daily, weather permitting. The show is free with general admission.<B>Carnegie Museum of Natural History,</B> 4400 Forbes Ave. in Oakland, has put on exhibit a life–size crystal skull, which has been locked away in the museum's mineral collection, in Hillman Hall of Mineral and Gems. The skull is being brought out in honor of the new "Indiana Jones and the Kingdom of the Crystal Skull" movie. "In Harmony with Nature II" by Donald M. Robinson, presenting more than 200 color photographs that portray the diversity of culture, wildlife, flora, and landscape of six continents and more than 60 countries, continues through Sept. 14. "Time Machines: Watches from the H.J. Heinz Collection" runs through July 6. 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, noon to 5 p.m. Sundays. C all 412-622-3131 or visit the Web site, www.carnegiemnh.org.<B>Heinz History Center</B>, 1212 Smallman St., presents "Pittsburgh Recast," featuring more than 50 pieces of work by members of the Pittsburgh Society of Illustrators through Sept. 7. Hours are 10 a.m. to 5 p.m. daily, except holidays. Regular admission includes both the History Center and Sports Museum and 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.