No, I haven't. It is probably not more than 15 miles from where I live, and I've never heard of it. I'll be sure to check it out as soon as it gets a little warmer! I have some strange mounds on my land, too; but I thought they were the previous owners's dogs! LOL.
I did the tour when I was a kid. I wasn't too impressed with the hills, cuz I don't think we were allowed to climb on them. The highlight was some kind of outdoor showcase that contained the bleached out bones of some poor soul.
From ground level, the mounds look pretty much like grassy berms.