Harmony Museum, 218 Mercer St., Harmony, offers guided 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 youths ages 6 to 17. Call 724-452-7341 or visit www.harmonymuseum.org.

Drake Well Museum, 202 Museum Lane, Titusville, will host the lecture “Guns & Oil: The PA Oil Region in the Civil War” by regional historian Margo Mong at 6:30 p.m. today. Admission is $5 for those ages 12 to 64 and $4 for those 65 and older. The museum is open year round. Spring and summer hours are 9 a.m. to 5 p.m. Tuesdays through Saturdays and noon to 5 p.m. Sundays. Call 814-827-2797 or visit www.drakewell.org.

Heinz History Center, 1212 Smallman St., opens “Pittsburgh’s Lost Steamboat: Treasures of the Arabia” Saturday. The Steamboat Arabia launched from Pittsburgh in 1853, sunk in the Missouri River and was discovered nearly 150 years later by treasure hunters 45 feet below a Kansas cornfield. The 8,000-square-foot exhibition showcases items from the pre-Civil War era, including nearly 2,000 objects perfectly preserved. A display of Bill Mazeroski’s 1960 World Series uniform and bronzed bat, on loan from the Tull Family Collection, continues through May 1. Center admission is $15 for adults, $13 for senior citizens, and $6 for students and children ages 6 to 17. Call 412-454-6000 or visit www.heinzhistorycenter.org.Phipps Conservatory and Botanical Gardens presents its May Market featuring staff horticulturists, local garden clubs, nurseries, farms and other vendors on the front lawn for a plant sale from 9:30 a.m. to 7 p.m. May 9 and 9:30 a.m. to 5 p.m. May 10. Admission to the May Market is free. The summer flower show will open May 10 with themed railroad displays. Phipps is reopening the Butterfly Forest on Saturday. Conservatory hours are 9:30 a.m. to 5 p.m. daily and until 10 p.m. Fridays. Admission is $15 for adults, $14 for senior citizens age 62 and older and students with valid ID, and $11 for children ages 2 to 18. Call 412-622-6914 or visit phipps.conservatory.org.ToonSeum, Pittsburgh’s Museum of Cartoon Art at 945 Liberty Ave., hosts an exhibit about the children’s book series “Little Golden Books” through June 30. Hours are 10:30 a.m. to 3:30 p.m. Mondays, Wednesdays and Thursdays, 10:30 a.m. to 7 p.m. Fridays, 10:30 a.m. to 5 p.m. Saturdays and 11 a.m. to 5 p.m. Sundays; closed Tuesdays. Admission is $6 for those over age 13 and $3 for children ages 6 to 12. Senior citizens, college students, veterans and active military pay $5. Call 412-232-0199 or visit toonseum.org.Children’s Museum, 10 Children’s Way, Allegheny Square, hosts “XOXO: An Exhibit About Love and Forgiveness” through Aug. 31. The museum is open 10 a.m. to 5 p.m. daily. Admission is $13 for adults and $12 for senior citizens and children ages 2 to 18. Call 412-322-5058 or visit www.pittsburghkids.org.Carnegie Museum of Natural History, 4400 Forbes Ave., Oakland, presents “Race: Are We So Different?, through Oct. 27. Hours are 10 a.m. to 5 p.m. Mondays and Wednesdays through Saturdays and noon to 5 p.m. Sundays with extended hours until 8 p.m. Thursdays. Closed Tuesdays. Admission is $17.95 for adults, $14.95 for senior citizens, and $11.95 for students with ID and children ages 3 to 18. Admission after 4 p.m. Thursdays is discounted. Call 412-622-3131.