Check out this great architecture of Germantown/West Mt. Airy & great trails along the Wissahickon Creek including Rittenhouse Town (built in 1690) in Philadelphia, PA. Most of these great houses are built from Wissahickon Schist and were constructed between 1913- 1930 give or take a few years. The biggest landmark is the Henry Av. bridge which is a long way down!