7 incredible circuits that no longer exist

Not all circuits can survive the ravages of time and money. Some struggled on for decades and then collapsed under the weight of modern pressures. Not all of those are really that missed, but some were considered the true greats. In fact some of those incredible circuits are now buried under a modern facsimile, a track that still holds the name of the original, but none of the mystique. These are the seven that we most wish could come back.