This has made me feel like a rubbish Evertonian.@Eggs @Exeter_Gently
We may not refer to it as a Roundhouse, but people do.
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Everton Roundhouse vandalised by Kopites
www.toffeeweb.com
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Merseyside’s hidden treasures: Prince Rupert’s Tower
PRINCE Rupert’s Tower, a beehive-like structure on Everton Brow, began in 1787 as an overnight lock-up for drunks and minor miscreants.www.liverpoolecho.co.uk
I'm sure there are more sources - I found these in a few minutes.