Sure, the real Stonehenge is moderately underwhelming, but have you been to America's Stonehenge in scenic Salem, NH?
I'll save you $20 and the bother of visiting NH (Unless you really, really like generic outlet malls...). It's a bunch or rocks piled in the woods that the proprietors claim to have been placed by Vikings or some other ancient seafaring people. If it wasn't for the morbidly obese new-age woman in the mumu flanked by two rail-thin gentlemen playing flutes and kissing the rocks, I would have felt completely ripped off.
I will also add to this the entire state of FL (God's waiting room...) and Las Vegas (Why???).