Virtually nothing is left of Aetna, or Etna, Furnace. This place, once a furnace, forge, and mill, is now nothing more than a hill with crumbling bricks on it. The dirt road leading to the furnace site is 1/4 mile in length and takes you right to the Tuckahoe River. Other than a nice short hike, there isn’t much to see here. I read in Forgotten Towns of Southern New Jersey that a 60′ tall smokestack was once part of the ruins, but it no longer exists. The furnace shut down in 1832.