Hampton Furnace after controlled fire

We decided to go geocaching around Hampton Furnace and Carranza Road. Upon reaching the furnace site, we noticed there had been a fire recently. The ground was black and crunched when we stepped on it. We walked around the area a bit and discovered that there is more than one foundation at the site of the furnace. The fire had cleared out all the undergrowth and revealed several things we never noticed before.

One foundation is filled with water and has reeds growing out of it:

We saw 3 large cylinders. No idea what they were though:

On our way out we noticed some of the fire was still going:

Author: Stu