The Elkhorn Valley Museum & Research Center, 515 Queen City Blvd. in Norfolk, has the Johnny Carson Gallery (his Emmys, costumes and a replica stage), the Nebraska Music Hall of Fame, the Square Turn tractor, Grandma’s House, a children’s discovery zone, a research center and changing exhibits; Verges Park on the grounds is open dawn to dusk. Open Tuesday to Saturday 10 to 5. Admission $7 adults, $3 ages 3–18, 2 and under free. Phone (402) 371-3886.