I recently found in the Living Histories site of the University of Newcastle, a photo of the Lambton Park rotunda from 1973. The rotunda was looking so sad and disheveled, and so different from current day appearances that my initial reaction on seeing the photo was that it was mis-labeled and was a rotunda somewhere else.
Constructed in 1890, the rotunda initially had iron palisade railings. By 1925 the rotunda had fallen into a bad condition. Extensive repairs were undertaken, including replacing the iron railings with arched brickwork, and replacing the wooden floor with reinforced concrete.
Newcastle Council later renovated the rotunda, reinstating the look of the original, including iron railings, a wooden floor, and the dome and spire above the main roof.