With that said, if you are looking for something unique to see and will be passing through...you can stop at the Old Sled Works and see the historic Duncannon Forest Fire Lookout Tower (formerly known as the Dauphin Water Gap Tower) which stands 110 feet tall. The tower was built back in the 1940's as a tourist attraction at a nearby restaurant on the other side of the Susquehanna River. Due to highway construction on routes 322/22, the tower was going to be demolished.
If you are healthy and energetic...you can pay a small admission fee and work you way up to the top for some beautiful views of the Susquehanna River and the surrounding areas. Not up for that? Well...you can go on in the Old Sled Works and do some shopping, play some arcade games, get a bite to eat and/or something to drink.
Like most small towns in America, there isn't much to see or do in Duncannon so I wouldn't plan a trip to visit but if you are passing through...we highly recommend that you check it out.