It was built in 1836, and financed from the estate of Charles Carroll of Carrollton, who was one of the signatories of the Declaration of Independence. Along with the saw mill, there was also a grist mill, a blacksmith shop, stables and quarters for workmen. Logs were processed here and then sent 1.25 miles down Devil's Alley, where they were then transported by canal and railroad to Washington and Baltimore. A parking area has been provided if you wish to get out and inspect the chimney. Over the next half mile, you might notice that the sugar maple is a dominant tree in this area.
Sugar maples thrive in areas of moisture and shade.
As you bear right at the next form, you pass such features as Roby Run and Pignut Ridge. Off to the left you will see Roby Cemetery. Many of the old headstones in this clearing serve as monuments to some of this area's early settlers and their descendents. The gurgling stream, rock strewn slopes and native vegetation create a landscape that is quite inspiring. There are 30 cemeteries of various sizes scattered within the forest.