Here lie the ruins of one of 3 aqueducts built to supply water to Caesarea during the Roman period.
This particular section is part of the High level aqueduct which sourced its water from Nahal Taninim (Crocodile River).
You can read here more about the aqueducts system.
If you walk a little bit East (toward the entrance to Beit Hananya), you'll find a milestone underneath one of the arches.
If you walk a little bit West, you'll reach Ada River and just might see some turtles.
Please be sure to properly rehide the cache after you sign the log.
The cache is on the north side of the aqueduct. You can easily cross by walking underneath the adjacent arch to the east of the cache.