Last fall my wife and I went on a hike sponsored by the Pinelands Preservation Alliance. Led by local archaeologist Scott Wieczorek, we explored the ruins of an early 20th century brick factory. Here is my favorite picture. In the upper right you can see a family picnicking on top of what used to be the drying tunnels.
The NJ Pinelands had a pretty colorful history before it became a National Reserve. To learn more, check out Ghost Towns and Other Quirky Places in the New Jersey Pine Barrens by Barbara Solem-Stull. It includes directions, maps and lots of info on many interesting sites in the Pinelands.