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The Ancient Wall Blocking the Cave of the Spring at Megiddo

The people of Megiddo (probably at the time of Ahab) constructed a wall to hide this cave from anyone outside the city.
After the wall was built, the passageway to the cave was filled with dirt so that the side of the tel was unbroken and there was no evidence that the cave or spring existed.

An opening in the wall was made in recent times so visitors could leave the cave without returning through the tunnel.