Can you solve this riddle?

Historic pinewoods and gardens surround me,
and I symbolise the relationship between God and earth;
much in the same way Dante represented heaven, earth and hell.
I am exceptionally dignified and illustrate a cosmogony of enormous importance for the evolution of one of the world's great civilisations.
I use the number nine repeatedly in the dimensions of my sacred altar, which symbolises heaven and also stresses the relationship of mankind with heaven.

What am I?

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