Philadelphia's Lost Waterfront
Looking straight ahead along Front Street, you can see how the road gently rises and falls over the terrain. This is the original high bluff on the edge of the Delaware River. Since Front Street has never been rebuilt, you are looking at a topographical vestige of the Delaware's original western embankment.
Front Street was an old native-American trail, hugging the river and leading north and south. It was the first street surveyed and built in Pennsylvania, and it was the principal thoroughfare during and after colonial times.