Perhaps one of this blog's readers can help with identifying the photos below. They are clearly of the same structure. The first one is from a book from the 1890s, where it is identified as the "Temple of the Ark" at Shiloh. The second shows Ephraim Stern teaching with the bullhorn on June 25, 1968. I have asked a few smart people about this, but without success. I am doubtful that this is at Shiloh, but I'm sure it is somewhere in the hill country north of Jerusalem. Does anyone know?
UPDATE (6/11): Indeed this structure is at Shiloh, to the east of the Visitor's Center, and now partially hidden by bushes. It apparently was a synagogue (Byzantine period?) before being converted into a mosque. Thanks to MB for the answer!