Hezekiah's Tunnel © Morgan Levy
Hezekiah's Tunnel is an absolute must-see for those who like to combine their sightseeing with a real sense of discovery and adventure. The tunnel is about 2,700 years old and was built by King Hezekiah in preparation for an invasion by the Assyrians. His plan was to shut down springs based outside the city, and redirect water through a tunnel under the city walls. In this way, he looked to protect Jerusalem's precious water supply and outlast the invaders.