We live in an age in which there's almost nothing left to discover. Everything that can be discovered, has been discovered. Everything than can be invented has been invented and we know how everything works and why. Nature has no secrets for us and we know all about the human mind and ancient history.
That's only what most of us think and it differs not from what people thought who lived 2000 years ago. And there's nothing wrong about that. It's just hard to think of the unthinkable.
Here some ancient objects which source or meaning dilutes us to this day: