What were some of the "treasures" humans hunted throughout world history?

The Holy Grail and the Fountain Of Youth

Explanation:

The Holy Grail was thought to be a relic containing Christ's blood, and possibly would be the missing link truly proving Christ's existence, so many people sought after it, which some forms of the grail being the cup that Jesus drank from during the last supper, although the bible has nothing to say on the matter. Also the Fountain Of Youth is a mythical spring thought to possibly make the user become immortal, with notable explores like Ponce De Leon searching for it in Florida, obviously with no success considering Ponce De Leon has been dead for 100's of years.

assessment is the missing word