I'm not American so the world in my grimoire may be different from yours .
But remember that warlock grimoire when he (the warlock )kills himself and end up in a garden ?he got cut by a rose that has the shape of a ghost ,and the ghost says that there was a place of life and light and not of dead thing created by a dead power ?
So that was probably the inside of the traveller ,since in one of the Rasputin's grimoire he is mentioned as the gardener
English
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I remember it, "You are a dead thing made in the form of a dead god. All you will ever do is kill. This is a place of the living. You do not belong here" is I believe what it said. If you look back at some of the concept art before release and in ViDocs, there's a few images of a circular inside of something that's green like a grassland and has the maze cut outs like the Black Garden does
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Yes I've seen it ,just think it makes a lot of sense ,but the only thing that doesn't fit is that the traveler is destroyed in some parts ,that should give us a view of its inside ,like that destroyed wall in Mars that give us access and a view to the black garden