The Ayalon Institute is just north of Rehovot, which is south of Tel Aviv. When you are on the ground level, it looks like a regular kibbutz. But once you get underground, visitors can tour Israel's first bullet factory.
This facility was built before the modern state of Israel was born - when the British were in charge. The bullet factory was used by groups of Jewish pioneers, who were working hard to make Israel a Jewish state. At that time, the Ayalon Institute produced over two million bullets - from 1946 to 1948.
Visiting the museum today, visitors can learn about this chapter of Israel's history, by watching a film and then touring the museum. Visitors even get to experience entering the factory through the secret entrance that kept the facility hidden from the British.
This would be one attraction my younger son would just love. He loves anything to do with the military. So if you add in bullets and hidden staircases, he'd be in his element touring this place.