I always wondered what happened to the secont time machine Clark built to follow Tempus through the centuries. We never find out.
So, what if Clark was able to keep/hide it somewhere? What would he do?
What he try to visit Krypton? Or to save people who died (Mayson, Vatman etc.) If so, would he be able to do so without changing history?
Just another one of my weird thoughts. :-)