Butler County Historical Society will present the third annual “Echoes from Our Past — Historic Cemetery Walk” at 11 a.m. and 2 p.m. Sept. 26 and at 2 p.m. Sept. 27 at Butler's North Side Cemetery, 1002 N. Main St. The event brings history to life through costumed actors portraying the characters and events of Butler County's ancestors. Tickets are $14 for the general public and $10 for historical society members and Butler Little Theatre season ticket holders. Proceeds benefit the historical society and the BLT. Tickets are available now, and sales will end at noon Sept. 25. No tickets will be available the day of the event. Tickets are available at www.butlerhistory.com or at the historical society office in the Senator Walter Lowrie House, 123 W. Diamond St., 9 a.m. and 3 p.m. Tuesdays through Fridays.

Mars Shortline Railroad has tiny train rides available. As long as weather allows, adults and children can catch rides from 10 a.m. to 2 p.m. Fridays and 1 to 4 p.m. Saturdays through September at the Mars History and Landmark Society's restored small scale B&O Train Station south of downtown at 1 Brickyard Road. Rides are free. Donations are accepted. Call 724-272-9588 or visit marshistory.org.

The Old Stone House has cooking classes. Bake oven classes are Sept. 19. Open hearth cooking classes are Sept. 12 and Oct. 10. All classes are at 10 a.m. to 2 p.m. Cost is $35 each, with a two-week advance registration required. Visit http://oldstonehousepa.org/tasteofhistory. The Old Stone House, at the intersection of Routes 8, 528, and 173 in Brady Township, is owned and operated by Slippery Rock University.

Harmony Museum, 218 Mercer St., hosts tours from 1 to 4 p.m. daily except when the museum is closed Mondays. Admission is $7 for adults, $6 for senior citizens, and $3 for ages 6 to 17. Call 724-452-7341.

Oil Creel & Titusville Railroad hosts a murder mystery dinner and train ride, “Movie Mayhem: Murder in the Sixth Sense” on Saturday. The evening begins at 5 p.m. at the Perry Street Station, 409 S. Perry St., Titusville, with a buffet dinner. The train departs at 6:15 p.m. and returns to the depot around 9 p.m. for dessert and the resolution of the play. Cost is $65 and reservations are required. Call 814-676-1733.Meadowcroft Rockshelter and Historic Village, Avella, Washington County, is open noon to 5 p.m. Wednesdays through Saturdays and 1 to 5 p.m. Sundays through Labor Day. Admission is $12 for adults, $11 for senior citizens, and $6 for children ages 6 to 17. Call 724-587-3412.

Carnegie Science Center, North Side, presents Water Weekends activities on Saturday and Sunday. Free Science Days on Saturday and Sept. 27 will offer free general admission thanks to the Jack Buncher Foundation. Center hours are 10 a.m. to 7 p.m. Saturdays and 10 a.m. to 5 p.m. Sundays through Fridays. The building will open at 1 p.m. Sunday. General admission is $18.95 for adults and $11.95 for children ages 3 to 12. Visit CarnegieScienceCenter.org.Fort Pitt Museum, Point State Park presents the exhibit “Captured by Indians.” Hours are 10 a.m. to 5 p.m. daily. Admission is $6 for adults, $5 for senior citizens, and $3 for children ages 6 to 17 and for retired and active military personnel. Visit www.heinzhistorycenter.org.Phipps Conservatory and Botanical Gardens, 700 Frank Curto Drive, continues the Summer Flower Show through Oct. 5. The Butterfly Forest is open through Sept. 7. Hours are 9:30 a.m. to 5 p.m. daily, and until 10 p.m. Fridays. Admission is $15 for adults; $14 for students and senior citizens; and $11 for children ages 2 to 18. Call 412-622-6914.Heinz History Center, 1212 Smallman St., hosts the “We Can Do It!” WWII exhibit. Center admission is $15 for adults, $13 for seniors, and $6 for children ages 6 to 17. Active duty and retired military pay $6. Visit www.heinzhistorycenter.org.National Aviary, 700 Arch St., has opened the Condor Court. The outdoor show “Soar!” runs at 3 p.m. daily on the SkyDeck. Aviary hours are 10 a.m. to 5 p.m. daily. The aviary is open Labor Day, the last day of the summer season. Admission is $14 for adults, $13 for senior citizens and $12 for children ages 2 to 18; shows are extra. Visit www.aviary.org.Children's Museum, Allegheny Square, presents “Very Eric Carle: A Very Hungry, Quiet, Lonely, Clumsy, Busy Exhibit” through Sept. 20. Museum admission is $14 for adults and $13 for children ages 2 to 18 and senior citizens. Hours are 10 a.m. to 5 p.m. daily. Visit www.pittsburghkids.org.Carnegie Museum of Natural History, 4400 Forbes Ave., Oakland, has on exhibit “Out of This World! Jewelry in the Space Age,” and “Animal Secrets.” Hours are 10 a.m. to 5 p.m. Mondays through Saturdays with extended hours until 8 p.m. Thursdays and from noon to 5 p.m. Sundays. Admission is $19.95 for adults, $14.95 for senior citizens, and $11.95 for children ages 3 to 18. Visit www.carnegiemnh.org.