graffiti in Algonquin Park

I found this in Algonquin park in Newburgh one day when I was smoking some weed. I have no idea who Miss Spade is, but for some reason i took a photo of this. The building was constructed by George Washington's army in the revolutionary war around 1775 or so. There are dozens of these stone structures scattered around the park, many of them scribbled over with graffiti. What can i say? This is Newburgh we're talking about.

Done