3,700 Year Old Wall ... inside City of David

Standing 8 meters (26 feet) high, the [Canaanite] wall of huge cut stones is a marvel to archaeologists.

"To build straight walls up 8 meters ... I don't know how to do it today without mechanical equipment," said the excavation's director, Ronny Reich. "I don't think that any engineer today without electrical power [could] do it."

Archaeologist Eli Shukron of the Israel Antiquities Authority added, "You see all the big boulders -- all the boulders are 4 to 5 tons."