...s mouth was a ferry, established in 1635, connecting with a road on the south bank through Brookline to Boston Neck. The only other communication with Boston was through Charlestown and by ferry to Copp's Hill . The inconvenience of depending solely upon ferries was soon felt, and by 1662 the Great Bridge was built, connected by a causeway with what we call Boylston Street, and leading across to what we c...