New Jersey has a rich mining history and abandoned mines are still hidden below the surface of our state... Schuyler Copper Mine in North Arlington dates back to 1715 and was one of the first copper mines in the United States. The Hibernia Iron Mines span over two miles in and around Rockaway, New Jersey and once served as the largest bat hibernaculum in New Jersey, with as many 30,000 bats each winter. Sadly, White Nose Syndrome took a toll on the population. According to the NJDEP, the Garden State is home to nearly 90 abandoned mines. All are closed to the public, except...

Sterling Hill Mine!

The Sterling Hill Mine is the fourth oldest mine in the United States and the last working underground mine in New Jersey. The main tunnel, which is open for tours regularly, is 1/4 of a mile long and wheelchair accessible. It features a lamp room, blasting demonstration and the stunning "rainbow tunnel." In total, there are 35 miles of tunnels in the mine. Your tour, however, will last a manageable two hours - highlighting some of the mine's most unique and important features. You'll also learn about daily operations and the life of miners. The tour includes one hour in the underground zinc mine, half an hour in their large exhibit hall, and about 10 minutes in their museum of fluorescence. Each area offers something different - I can't even choose a favorite.

The mine is very special, especially to geologists.

The area is home to 357 types of minerals - 10 percent of all known minerals. 35 of these minerals have not been found anywhere else in the world. In addition, the zinc ore found here is very rich, made up of about 20% zinc - this is significantly above average. Primary deposits include zinc, iron and manganese though trace amounts of silver and gold can be found. 91 of the minerals at Sterling Hill fluoresce. New Jersey is the fluorescent mineral capital of the world!

Which leads us to the rainbow tunnel...

One of the most beautiful attractions I have ever seen! The fluorescent rainbow tunnel is the only one of its kind in the world. A unique natural formation, it is truly breathtaking. The photos don't do it justice - you have to see it for yourself. Keep an eye out for the ghost of Pete, a former miner. Legend has it that he fell down the shaft to his death and never left. I've also heard stories about a miner who retired but found his way back in the afterlife.

Tours are held at 1 p.m. daily during the month of June; in July and August, 10 a.m. tours are also available. You can visit Sterling Hill Mining Museum at 30 Plant Street, Ogdensburg. For more amazing New Jersey day trips, check out this list.