Maridon Museum, 322 N. McKean St., will host its annual “Treasure or Trinket?” event from 10 a.m. to 3 p.m. Oct. 13. Antique dealers will be identifying what makes an item collectible. Verbal appraisals will be given for a $5 per object donation, limited to 10 items altogether. The museum is open 11 a.m. to 4 p.m. Wednesdays through Saturdays. Admission is $4 for adults, $3 for senior citizens and students, and free for children younger than 8. Tours are available with advanced notice for no extra charge. Call 724-282-0123 or visit www.maridon.org.

Hoyt Institute of Fine Arts, 124 E. Leasure Ave., New Castle, presents the work of three contemporary artists from the Mid-Atlantic region through Friday. Admission is free. Hours are 11 a.m. to 8 p.m. Tuesdays and Thursdays and 11 a.m. to 4 p.m. Wednesdays, Fridays and Saturdays. Call 724-652-2882 or visit www.hoytartcenter.Red Brick Gallery, 17 Main St., Foxburg is featuring “Botanicals and Beyond,” a mixed media exhibit, through Sunday. Hours are 4 to 8 p.m. Fridays, noon to 8 p.m. Saturdays, and 1 to 6 p.m. Sundays. E-mail edmonds@embarqmail.com.

Carnegie Museum of Art, 4400 Forbes Ave., presents “Natural History,” an exhibition that explores the ways contemporary artists respond to nature, through Oct. 14. Hours are 10 a.m. to 5 p.m. Tuesdays through Saturdays, with additional hours until 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Admission is $17.95 for adults, $14.95 for senior citizens, $11.95 for students with ID and children ages 3 to 18, and free for children younger than 3. Call 412-622-3131 or visit www.cmoa.org.Silver Eye Center for Photography, 1015 E. Carson St., hosts “No Job No Home No Peace No Rest: An Installation by Will Steacy” through Dec. 15. Hours are noon to 6 p.m. Tuesdays through Saturdays. Admission is free. Call 412-431-1810 or visit www.silvereye.org.Society for Contemporary Craft, 2100 Smallman St., hosts “Humor in Craft” through Oct. 27. Hours are 10 a.m. to 5 p.m. Mondays through Saturdays. Admission is free. Call 412-261-7003.