This tall, blue, cast-iron tower at the intersection of Justice Mill Lane and Holburn Street seemed curious. Is it a monument and, if so, for what? Turns out this is a ventilator for the retired cable subway. Its Art Nouveau design by Hector Guimard was manufactured by Walter Macfarlane & Co. in Glasgow and then installed in 1905. Behind it is the cupola of the former Holburn Central Parish Church. The building was constructed in 1836 for the Church of Scotland and the tower was added in 1891. Today it is occupied by The City of God.
