The word "treasure" refers to something valuable and precious, like gold, jewelry, or important documents. It can also mean something or someone very cherished or appreciated. Full definition
It started a lifelong search for treasures of the past in old books. (bookpage.com)
That's not even scratching the surface of what you get in treasure trove. (amazon.com)
I spent a not particularly fun family road trip finding every last piece of treasure in the first one, so it will always have fond memories for me. (gameological.com)