Our past has a lot in store for us. From plain history lessons to awesome stories, a lot can be told. But not only stories are rich in the past, the value of stuff from the past is really nice as well, if you know who to talk to and how much each item really cost.
Antiques are either a real mess or a real treasure if you just know which is which. Coins and war items are the most famous to keep and sell later in life because a lot likes to collect them and most of the time the piece you have is what these collectors need for their own collection to be complete.
Whatever old stuff you got now, I think you should try appraising, so that you may know their current worth, but always remember that this stuff are kept there up until this moment for a reason and you should never forget to know why, because what may be pure gold to you, a real precious jewel to others.