More recently the area now known as Penns Valley was discovered by General James Potter in 1764 who trekked through the region and observed the prairies and woodlands of the area and settled at Old Fort, near Centre Hall, in 1774. Upon observing the valley from above he exclaimed, "... I have discovered an empire." Penns Valley also hosts the oldest town of Centre County, Aaronsburg, which was planned out in 1786. At the close of the 18th century Penns Valley was already set aside for farmland, however, the surrounding county rapidly boomed as iron ore was discovered and the first road built by Philadelphia land speculator Reuben Haines brought the rest of Pennsylvania into the heart of Penns Valley terminating at the location of Spring Mills.