In 1938 there was a large exhibition in Glasgow, the Empire Exhibition, which proved to be the last ever public showcase of the British Empire. Glasgow, the chosen venue, was at the time the 2nd largest city in the UK, and was known as the “workshop of the Empire” due to its prominence in industry, notably steel works and ship building.
The Tait Tower (designed by T.S.Tait) was a centerpiece of the exhibition. It was built in pre-fabricated sections by Glasgow steel workers and was thus able to be erected in only nine weeks. The tower was 300 ft tall and had 2 lifts which transported over a million visitors to the viewing platforms over the 5 months of the exhibition. 600 people at a time were able to enjoy the views which gives an idea of the size and stability of the structure.
The empire exhibition was opened in may 1938 by King George VI and closed in october of the same year. The Tait tower had a short existence, being demolished in 1939 due to concerns about it being a marker for enemy bombers in the coming war.
I wish I had seen it, you can see a souvenir here