There once was a partly built replica Iron Age roundhouse. Then there was a storm, or two, and the roundhouse vanished, leaving just a doorway to nowhere (which is also a song apparently).
Now you see it, now you don’t
Avalon Archaeology 'Hands on Heritage'
Archaeology and Experiments on the Somerset Levels
Avalon Archaeology 'Hands on Heritage' 
;(
So gutted for you, I know you will all build it back stronger than ever. Sending much luv – Tanya ;0)