I suppose it depends on your objective... are you interested in frontier forts? Or forts in the Revolutionary war in general? Or forts that are still standing and can be visited today? There were key forts in Pennsylvania, Virginia, Ohio, etc used in the French and Indian War and Revolutionary war. Some were permanent forts like Fort Pitt, built near the remains of Fort Duquesne; or Fort Clinton and Montgomery along the Hudson river with their deadly river chain; some were like the fort commanded by Ichabod Alden at Cherry Valley in New York where it was more of a temporary building surrounded by wood palisades, which were solid enough to shield those inside from the massacre happening in the town.