Composed of mica, feldspar, uranium, and beryl, Ruggles Mine dates back about 400 million years. The mine was in operation in the early 1800s and became a tourist destination in the 1960s. Now closed, the mine and property are for sale for about 2 million dollars. As it is still private property trespassing isn't recommended. But perhaps you're looking for a career change and are in the market for a mine!