While it’s nice and cool this spring, explore the rich heritage and longstanding tradition of Kokomo Opalescent Glass, America’s oldest art glass company. In its original, Kokomo, Ind., location since 1888, public factory tours are given Monday-Friday at 10:00 a.m. Groups tours by appointment. During the tour, watch as opalescent glass is made, shipped all around the world, and hand blown by local artists. The OP Shop offers a wide selection of sheet glass, cast glass, rondels, and beautiful blown glass items. Classes also are offered throughout the year. Note: No open toe shoes or sandals permitted on the factory tour, details about which are here. For other things to do and see while you’re in the area, the Greater Kokomo Visitors Bureau has many interesting suggestions here.