Confession:

[glatt]

It's kinda freaky going there, because you have to park at the National Guard facility and walk past the army equipment and all the warning signs about trespassing on US military property, but it's clearly marked where you can go. It just doesn't look anything like a park when you drive up to it, and you have to walk for ten minutes or so into the woods before you start finding the rock piles and quarries.