Just got home from a camping trip to Porcupine Mountain State Park. Today at my sons request we went to the Adventure Mine in Greenland and do the tour. What a cool place and great tour. It really amazes you the amount of work and hard life's people had back in the 1800's. Swinging a hammer for 10 hrs/day, 6 days/week, for $1/day. And we think we have it rough. And the amount of tunnels they dug that way, incredible. I'd like to go back for their longer tour someday where you rappel down sections and spend more time in the mine.