An interesting question, @slowwalker.

If one sees the past as simply history, an exact reproduction of a monument will suffice.

But if one sees these tombs and monuments as sacred places, then there is a duty to be performed in order to respect the dead.

Places are made sacred through reverence and memory and when one generation passes, the responsibility falls to the next.

So, to answer your question, in the matter of monuments and tombs we must respect the old and preserve them