House of the Day: Room for a Collection of Cars -- or Buses

For some tycoons there may come a time when collecting cars -- as relatively limited in super-model capacity and money-flaunting value as they are -- gets old. The Maserati that used to give you that tingling feeling just doesn't anymore. And your cavalcade of Hummers? Well, that's got all those tree-hugging environmentalists breathing their granola-scented breath down your neck.