Or you could do a race through the different time periods like I said to Racerboy, like stone age to medieval to modern to futuristic.
Bonus points if it is the same basic track, just with vital modifications. I like your idea.
Like, there's a track in stoneage. In medieval, there's some castles and wooden stuff blocking up a piece of the track but another readily available. In modern, the fortress is in ruins, so it is possible to pass through. However, in another piece of the track, the ground surpated and a steadier bridge is made nearby. In futuristic... you get my idea.
