臺北蓋水系列-北市水利處將人孔蓋大改造，融入美感及地方特色與風貌，推出特色人孔蓋，取其台語諧音"很美"，故為"蓋水"，本項為"松山之詩-夜篇"。
人孔蓋地圖
*Stage1 manhole
Near the manhole, there is a benchmark on the ground (check photo) , check the number of benchmark then get AAA.
And, there is a lamppost near by benchmark, check the number of lamppost "2020XXX" then get XXX.
go to stage2
*Stage2 道後溫泉祈福機械鐘 (clock tower)
Find out what day the tower was set up. The date is "2013.10YY" then get YY.
*Final
Caculate coordinates
N 25°03.(AAA-117)',E 121°34.(XXX-YY)