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Black mustard grows quickly and will soon be sending out seeds that could easily invade the pristine soil on the structure.

"You could be forgiven for watching those first episodes and thinking that these people were living in pristine environments in the middle of nowhere, untouched by the outside world," he says.

This rendered them in pristine condition but also made them quite fragile, which is why after uncovering several 6-inch spots and confirming that the frescoes were intact, Graves immediately covered up the art again.

A rarity for the National Park Service, the Point Reyes National Seashore has, since its founding in 1962, encompassed not just pristine wilderness but also working agricultural land.

Doors and windows at once pristine luxury electric vehicle showrooms are now scrawled with profanity and Nazi symbols.