Many tourists have gone on a brewery or distillery tour or been through the chocolate wonderland that is the Hershey's Chocolate Tour in Pennsylvania. But guitar factories, cigar makers, motorcycle plants, and other fascinating sites are also open to visitors. This survey of more than 30 tours — all free or less than $10 a person, unless otherwise noted — can add an educational element to your next vacation and may also offer free samples, along with fun memories. The COVID-19 pandemic changed many companies’ policies regarding tours. Check official websites for the most recent information before planning a visit.