Bettison's Folly is a tower in Hornsea, East Riding of Yorkshire, England. Also referred to as Bettisons Tower and the Forgotten Folly, it was built some time between 1829 and 1853 by William Bettison.
At the time, Bettison was a Hull-based brewer who built the folly in what was then his garden. In those days communication was by sight, so his manservant would ascend the tower at the usual time his master returned from work, see him descending Southorpe hill and run down the tower to ensure "dinner was served" as the master walked into the house. It incorporates a cranked up flagpole, initially installed to convey private messages. During the Second World War the tower was an air raid look-out point and siren (Hull was the most heavily bombed UK city after London). The siren was still in use in the late 1950s when a new siren was erected on the new firestation on Southgate. The Folly is decorated with locally made "treacle" bricks, highly fired for durability and subject to misshaping.
- "Forgotten folly". BBC Humberside. BBC. Retrieved 11 May 2010.
- Peach, Howard (2001). Curious tales of old East Yorkshire. Sigma Leisure. p. 32. ISBN 978-1-85058-749-1.
- Historic England. "Folly (1249626)". National Heritage List for England. Retrieved 27 February 2013.
- "Heritage open days". Driffield Post. 5 September 2007. Retrieved 20 September 2009.
- "The Top 10 Pieces Of Folly Architecture (PHOTOS)". Huffington Post. Retrieved 8 June 2015.
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- British History: Hornsea
- Historic England. "Details from listed building database (1249626)". National Heritage List for England.
- BBC article on the tower
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