What do you know about the earliest crossings over the Charles River in Boston? When it was founded, the town of Boston occupied the tip of the narrow Shawmut Peninsula, with the harbor on one side and the Charles RIver on the other. Residents relied first on ferries, and later on a series of bridges to connect them with the surrounding towns and countryside. The progression of bridge construction illustrates not only the state of construction technology, but also the birth of corporations in America and a landmark Supreme Court case defining the limits of private property rights.