These unusually shaped houses in Kent were once free-standing kilns used for drying hops, for beer making. The vanes on top are to catch and direct the wind to dry the hops. The oldest ones were built in 1750, and most are now sought after as very desirable homes.
Aren't they beautiful, I would love to live in a house like this. I always had a fantasy about living in a round house when I was a child. Either in a lighthouse or a windmill, but an oast house would do nicely.