New research suggests that the Roman prefect Pontius Pilate is the one that built the Biar Aqueduct, the most sophisticated ancient aqueduct of the Jerusalem area. The study also uncovered the way the unique aqueduct was constructed.
The aqueduct is part of the ancient water system serving Jerusalem. Biar, the shortest of the aqueducts, brought water from a point south of Bethlehem to Solomon’s Pools. Other aqueducts carried the water from there to Jerusalem. The five-kilometer aqueduct includes the Biar Spring, an underground shaft tunnel running about three kilometers, a surface channel and dozens of piers used for its construction and maintenance....
Archaeologists exploring Jerusalem have known of the aqueduct for a good 150 years. It has been dated from the Hasmonean period, in the second century B.C.E., through Herod to the late Roman period of the second century C.E. Yechezkel’s team used carbon dating of plaster to suggest that the aqueduct was built in the mid-first century C.E., before the destruction of the Second Temple. They believe Pontius Pilate, the Roman prefect from 26/27 C.E. to 36/37 C.E., known for condemning Jesus to death, ordered its construction.It's from a Haaretz article, which is quite interesting.