I've never actually been there. I've been to House on a Rock a few times which isn't too far away. From the IL border to the Dells there are about 800,000 signs for it. I've always wanted to go, but for some reason we never have.
House On The Rock was GREAT! My folks and I went to Wisconsin for Christmas in 2003 and spent a week there. Mom wasn't too keen on the Infinity Room though, the rest of us all went out to the tip together. LOL! They featured HOTR on Travel Channel's Top Ten Outrageous Homes program last week, it ended up being #1. Particulary for the Infinity Room and the gigantic carousel. :)