This underground passage from Gihon Spring to the southern tip of the Temple Mount is one of Jerusalem's most exciting archaeological discoveries. The tunnel passes through the sewer channel of the time of King Herod the Great. Its cobbled pavement is the oldest street in Jerusalem since King David. It was along this street, about seven hundred meters long, that Jewish pilgrims were climbed the temple mountain after having bathed in the Siloam basin. If the passage is closed due to weather conditions, you need to go back to the main entrance to the park City of David.
Photo By Deror_avi - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=27802460