Hanging Rock - Credit: Wikimedia Commons
Hanging Rock, also known as Overhanging Rock, or locally as Drummond's head, is a historic natural feature which is located in Gulph Mills, Upper Merion Township, Montgomery County, Pennsylvania. It is a large natural outcropping of phyllite that protrudes approximately eight feet over a roadway, Pennsylvania Route 320 (South Gulph Road), which was laid out as a public highway between 1711 and 1712. Read more on Wikipedia
Source: en.wikipedia.org