This is a mega example of repurposing!
Check out the link to Wikipedia about the Melbourne Central Shopping Centre
“Contained underneath the shopping centre’s massive glass cone sits the Coop’s Shot Tower which was built on the site in 1888. After last being used in 1961, the tower was retained to become a focal-point of the centre, R.M. Williams and the Shot Tower Museum now take up the inside of it.”
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shot tower in Melbourne Central Shopping Centre