Waterworks What's Beneath Those Brick Circles In San Francisco Intersections? By Audrey Dilling • Oct 7, 2019 Courtesy of Scott Kildall/ Waterworks Listen Listening... / 7:54 Our stories are made to be heard. If you can, please listen. Chava Kronenberg is on a manhole hunt. “Oh! Wow! There it is! We have a winner!” she exclaims near the intersection of Geary Boulevard and 5th Avenue in San Francisco.