Meadowcroft Rockshelter and Historic Village, 401 Meadowcroft Road in Avella, Washington County, the oldest site of human habitation in North America, will host an Independence Day celebration on July 4. Through Labor Day, Meadowcroft will be open noon to 5 p.m. Wednesdays through Saturdays and 1 to 5 p.m. Sundays. Admission is $12 for adults, $11 for senior citizens and $6 for children ages 6 to 17. Call 724-587-3412.

Heinz History Center, 1212 Smallman St., hosts an exhibition exploring Pennsylvania’s impact on the Civil War, featuring 150 artifacts, six lifelike museum figures, and a 26-foot Rodman cannon, through Jan. 5. Admission to the exhibit is included with the regular History Center admission of $15 for adults, $13 for senior citizens age 62 and older, $6 for students and children ages 6 to 17, and free for children age 5 and younger. Call 412-454-6000 or visit www.heinzhistorycenter.org.Phipps Conservatory and Botanical Gardens, 1 Schenley Park, hosts Farmers at Phipps from 2:30 to 6:30 p.m. Wednesdays through the last week of October. The Butterfly Forest continues through Sept. 2, and the Summer Flower Show: Glass in the Gardens runs through Oct. 6. Conservatory hours are 9:30 a.m. to 5 p.m. daily and until 10 p.m. on Fridays. Conservatory admission is $15 for adults, $14 for senior citizens and students, and $11 for children ages 2 to 18. Call 412-622-6914 or visit phipps.conservatory.org.National Aviary, 700 Arch St., has opened the interactive, free-flight show “Talons!” featuring birds of prey showing daily at noon and 2:30 p.m. The show is $5 in addition to the regular cost of admission, which is $13 for adults, $12 for senior citizens, $11 for children ages 2 to 18, and free for children younger than 2. Call 412-323-7235 or visit www.aviary.org.Children’s Museum, 10 Children’s Way, Allegheny Square, is showing “Adventures with Clifford the Big Red Dog.” Regular hours are 10 a.m. to 5 p.m. daily, except major holidays. Admission is $13 for adults, $12 for children ages 2 to 18 and senior citizens, and free for children younger than 2. Call 412-322-5058 or visit www.pittsburghkids.org.Carnegie Museum of Natural History, 4400 Forbes Ave. in Oakland, presents “Roads of Arabia: Archaeology and History of the Kingdom of Saudi Arabia” Saturday through Nov. 3. “Roads of Arabia” examines the impact of ancient trade routes that crossed the peninsula through more than 200 recently excavated objects. More than 60 fine art jewelry pieces inspired by nature are on display in “Garden of Light: Works by Paula Crevoshay” through Aug. 11. Museum hours are 10 a.m. to 5 p.m. Tuesdays to Saturdays, with extended hours until 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Admission is $17.95 for adults, $14.95 for senior citizens age 65 and older, and $11.95 for students with ID and children ages 3 to 18. Admission after 4 p.m. on Thursdays is $10 per adult/senior citizen and $5 per student/child. Call 412-622-3131 or by visiting www.carnegiemnh.org.