boat access, plus natural protection from the wind and waves. An additional element of Provincetown's geography tremendously influenced the manner in which the town evolved: the town was physically isolated, being at the hard-to-reach tip of a long, narrow peninsula. The East Harbor, which provided the most protected mooring place in Provincetown, had a inlet from Provincetown Harbor, and effectively blocked off access to Provincetown by land. Until the late 19th century, no road led to Provincetown – the only land route connecting the village to points back toward the mainland was along a thin stretch of beach along the shore to the north (known locally as the "backshore"). A wooden bridge was erected over the East Harbor in 1854, only to be destroyed by a winter storm and ice two years later. Although the bridge was replaced the following year, any traveler who crossed it still needed to traverse several miles over sand routes, which, together with the backshore route, was occasionally washed out by storms. This made Provincetown very much like an island. Its residents relied almost entirely upon its harbor for its communication, travel, and commerce needs. That changed in 1868, when the mouth of the East Harbor was diked to enable the laying of track for the arrival of the railroad. The railroad was completed, to great fanfare, in 1873; and the wooden bridge and sand road was finally replaced by a formal roadway in 1877. The railroad terminated at Railroad Wharf, known today as MacMillan Pier. It provided an easy means for fishermen to offload their vessels and ship their catch to the cities by rail. The railroad was not the only late arrival to Provincetown. Even roads within the town were slow to be constructed: The town's internal road layout reflects the historic importance of the waterfront, the key to communication and commerce with the outside world. As the town grew, it organically expanded along the harborfront. The main "thoroughfare" was the hard-packed beach, where all commerce and socializing took place. Early deeds refer to a "Town Rode", which was little more than a footpath that ran behind the houses. In 1835, County Commissioners turned that into "Front Street", now known as Commercial Street. "Back Street" ran parallel to Front Street, but was set back from the harbor − today it is known as Bradford Street. Geography Provincetown is located at the very tip