Here are many old photographs from 1919 depicting the mountains/forests/trees/beautiful areas of Pennsylvania, from the book "Seeing Pennsylvania" by John T. Faris.
Some of these photos are really indeed beautiful, and some even show old-growth forests, such at Buck Hills Falls, and other places.
Let me know if anyone has any questions or wants more info about certain photos.
UPDATE: As I was reading a copy of "Penn's Woods 1682-1932", I discovered that Edward Wildman reported about the forest at Buck Hill Falls, and how the site showed quite a few old-growth trees. Here is his description as in the book:
So this site may have many impressive trees now days, if the Hemlocks have not been killed by HWAIn the glen at Buck Hill Falls, eleven miles east, there are several hemlock trees which may well be 250 years old [germinated in 1682 or before] or more. The largest measures ten feet, six inches at breast height, and two others are more than 9 feet.
Here is a description of some 22 waterfalls located near Jim Thorpe (then called Mauch Chunk). Anyone have any idea if they still exist today?