Wouldn't it be cool, if its a medieval that followed after the collapse of a much more advanced civilization?

So you have all these magical gadgets and technology no one knows how to use, and could be jury-rigged into other things. Could even be a lost age of culture and knowledge.
If information was stored magically into other devices, and books of the era have long since turned to dust, future inhabitants would have no way to discover this knowledge. It'd be like several chapters missing from the history books.