Jesus said, "Let him who seeks continue seeking until he finds. When he finds, he will become troubled. When he becomes troubled, he will be astonished, and he will rule over the All."
The Holy Grail is a metaphor for a woman's reproductive organs. Y shaped anyone? Ovaries and all.
Precisely. Also cup shaped?
Only the Grail can restore and renew the land through a rightful King.
YouTube is full of urban explorers who go down there all he time. Urban spelunking is fun! Ok and gross.
Most ancient Western cults call the land mother because it provides. Relate to eastern cults who experience mostly harsh desert and worship male sun gods.
You will only ever get the surface of it from books.
Some knowledge only available to initiates.