The caption for the picture of the room inside the Golden Gate reads: "Interior of Golden Gate." Library of Congress, credit to the American Colony.
Now it gets weirder.
Get ready for really weird
My theory is the bones date back to 625 CE when a Jewish revolt aided the Persians vs the Byzantines.
Led by Benjamin of Tiberias, the Jews controlled the city for several yrs, possibly even restoring religious life on Temple ruins.
Bones? Everyone massacred everyone.