Below are photos of an almost completed renovation of a water an old water storage in Melbourne's Royal Botanic Gardens known as Volcano, named as such because of its shape. Volcano was built in 1878 and was filled with water pumped either directly from the Yarra River and later Yan Yean Reservoir. The design was by renown architect William Guilfoyle and is twenty nine metres in diameter and has a capacity of 1.3 million litres of water.
Volcano fell into disuse in the 1950s and became overgrown and well hidden to anyone who did not know it was there. It is in the highest point of the gardens, and right on the fence line next to the The Tan. Clearly it won't fill by water run off.
A pretty marvellous way to spend $1.7 million I reckon. I am excited. Much of the money was donated by the Myer Foundation. The bottom picture is from The Age and shows the interior after it was cleaned out. Here is a link to a pdf file with more information.