La Pasionaria is a tribute to the volunteers who left Glasgow to fight fascism in the Spanish Civil War of the 1930s.
The image of a female figure with her arms outstretched towards the sky is visible to those who pass along the Clyde Walkway at Clyde Street, in front of the Custom House building.
But thousands of motorists pass the spot every day without realising it is there.
La Pasionaria (the passion flower) was built to represent Dolores Ibarruri, a heroine of the Spanish Republican movement.
The figure stands on a plinth with the inscription "Better to die on your feet than live for ever on your knees".
And a plaque beside the statue reads: "The City of Glasgow and the British Labour Movement pay tribute to the courage of those men and women who went to Spain to fight fascism 1936-1939. 2,100 volunteers went from Britain, 534 were killed, 65 of whom came from Glasgow."
When the monument was commissioned in 1974 it caused a good old-fashioned political stooshie.
The Conservative councillors in the city objected to it and promised to get rid of it as soon as they got into power.
An official unveiling had to be postponed in case of a protest, instead the statue simply "appeared" one day.
The artist was also an interesting character. Arthur Dooley, from Liverpool, was an Army deserter who joined the Palestine Liberation Organisation before being caught and jailed.
He became a self-taught sculptor but gave away his fees and lived penniless in working men's hostels.
There are many Glaswegians who would like to see La Pasionaria sited more prominently as they feel it represents the city's traditional left-wing, working-class politics.