__SPACER__ Tunnels under Jerusalem form an integral part of the citys history. From its original capture by the Israelites from the Jebusites via the Gihon springs water shaft to Hezekiahs tunnel which helped protect against the Assyrians in 700 BC.
The fascinating part is seeing these for real. History Channel had a program on them that included a bend in the tunnel. The answer to the obvious question was to go around an outcropping of denser rock. Geology has determined much in that area.