The cache is not at the posted coordinates. I am not a fan of puzzles. But maybe, as I console myself, I'm better at making them than solving them? I guess we'll find out.
You are solving for: N39 X.0XX W77 XX.XXX
I'll explain it all if you'll just follow me. Come along now, let's go down this staircase. Of course you didn't know it was here -- it's hidden. That's why I'm leading! It's spooky and dark, you say? Fine, we can walk by the light of this candle. Yes, yes, it IS twisted, but it still burns bright. It'll light the way to the end of these stairs... and here's where we end up. We've come out at the farm -- the one with the red gate. And the red barn with cows in it.
Let's sneak inside the farmhouse and peek at the shelves. Oh look, there's the Beatles' Hard Days Night. That is one old album! Ohhh, and here's a box encrusted with jewels! So pretty! You're opening it? How nosy of you! What's in there? A yellow, aging envelope? No, no, don't read it -- just shut the box with the mysterious letter and let's get out of here before someone sees us. I hear the dogs barking! Besides, you have everything you need now!
So go find it! (I did consider providing a hint, but decided I wasn't keen on the idea.)