Answer:
I occur twice in eternity. And I'm always within sight.
What kind of apple isn’t an apple?
What has four fingers and a thumb but is not alive?
Ancient and majestic, great big piles of stones, Used to encase both riches and bones. Seen from certain angles, They look like big triangles.
This is the main ingredient in spaghetti and Mac-N-Cheese.
It is something you will never see again.