Every town has that house that outdoes itself at Christmas. Legendary for miles around, it is the place to see dazzling holiday decorating of the eye-popping, traffic-stopping sort. This flickering showcase bedecked with tens of thousands of lights is hard to resist--and ignore--as often every square inch is caked in Christmas, from snowmen to elves, carousels to candy canes. But who lives in that house--and houses like it around the country And what...