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View from above looking down into the "Lerna Courtyard" that is located to the west of the Asclepius Temple platform—the corner of the temple platform, from which this picture was taken, is visible on the lower left side of the image.
In the center and right of center note the foundations of the open rectangular courtyard that was covered with a mosaic floor and surrounded by a colonnade. Beyond it, and to the left (south) of it, are the entrances into rock cut pools that collected water from the Lerna spring.
For a brief description of this Asclepion and Asclepions in general Click Here.