Dating to 1370, this surprising solitary structure looks more like a disused windmill or a Rapunzel-esque fairytale prison cell than a birdhouse.
With its substantial 3-foot-thick walls, this 30-foot-tall feathery fortress is all that remains of a medieval collegiate religious complex in Sibthorpe, Nottinghamshire.
The outlandishly gargantuan dovecote, which housed over 1,200 pigeons in tiny nesting niches perched 24 stories high, was built by monks in response to a famine of 1360. It was intended to provide an unlimited supply of meat, eggs and a rather smelly fertilizer to safeguard against future starvation.
Beside the tower, strange undulations reveal another of their attempts to provide a cheap and readily available source of protein, as several long-drained mediaeval fishponds are still discernible.
Having stood tall for more than six centuries and outlasted all of the mediaeval monks other architectural efforts, Sibthorpe Dovecote is now a fully protected grade I listed building and is owned by Nottinghamshire County Council.