USS Constitution and Museum is housed in an 18th-century ship. Photo credit: Zack Frank / ShutterstockFor warships up-close, visit the USS Constitution berthed at Boston’s Charlestown Navy Yard. This 18th-century frigate is the world’s oldest commissioned warship still afloat.Explore its decks to see its cannons and living quarters, and chronicle its history at the USS Constitution Museum.How to Visit: Book a hop-on hop-off or city tour that calls here or a harbor cruise that includes time to go aboard.