Boston is a very active seaport with cargo and passenger vessels coming into the Harbor and leaving through two shipping lanes going to and from the piers and docks in South Boston, Chelsea, and the Mystic River. Skyscrapers are perched on the shores of the Harbor, and they are nothing short of spectacular to look at from the water. Sailing along this waterfront sure beats walking or driving in your car, hands down, because you can get a good view of the magnificent office towers, condominium complexes, and hotels. These modern sites are interspersed with several important historic sites from the American Revolution.