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View of the interior of one of the large cisterns that supplied water to the palace/fortress of Machaerus. This huge cistern is about 20 ft. [6 m.] high and 80 feet [25 m.] long.
Cisterns were sometimes used as prisons—see Jeremiah 38:6–13 —and it is possible that John the Baptist was imprisoned in one of the cisterns of Machaerus.
This image courtesy of Mark Connally.