Our connection with our past is only going to get weaker as the years pass and the physical remnants of history decay. You'd think we were taking pains to slow this process down, but instead, the human race seems insistent on consigning as much of history as possible to oblivion before anyone's in danger of actually learning anything.
The human talent for creating works of majesty and art seems matched only by the human capacity for losing them. History's lost property box is crammed with art, technology, literature, and even large groups of people who have simple been lost.
Note that these aren't examples of malicious destruction. They are things that have simply been stolen and never recovered, that have vanished during an accident or catastrophe or, in a dismayingly large number of cases, lost through simply failing to keep tabs on where they were.
We box them up and forget where we put them, we give them to some random guy who walks in with a clipboard, and more often than anything else, we just throw them out with the trash.