Cash is not at the posted coordinates. I have been near here before, but oh well.
Solve the puzzle and have some jam.
N 38° 46.ABC W 121° 23.DEF
What year?
A = Chicago Crib Disaster
B = Albert Einstein graduates from Federal Polytechnic in Zurich
C =John Adams Becomes First President to Live in the White House
D = Joseph Fourier discovers "greenhouse effect"
E = Edward 'Blackbeard' Teach is Killed
F = Giovanni Albani (Clement XI) elected Pope
You can validate your puzzle solution with certitude.