But there's a silver lining: It won't eat you

The grimy, black biofilm that's creeping over the Jefferson Memorial

Biofilm, a microbial invasion of uncertain origin, has begrimed the stone surface of one of the nation's most hallowed monuments, and is also on the memorial amphitheater at Arlington National Cemetery, the Washington Monument and the Lincoln Memorial. And it can't be killed.

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[ED NOTE: I posted this when away from home. There was an image but apparently now there's not. Also, I wasn't aware viewing the story requires payment. My bad, times two.

[Still, I'm leaving the post in place because biofilm.]