Taken earlier in the year, before this thread even started, but thought I would post it as it is quite unusual. I have cycled past this strange building on Shenley village pond numerous times but only recently got around to investigating it.
It was built in the 1700's and called "The Cage". It held prisoners overnight - anyone from animal thieves, robbers, poachers, highwaymen to murderers. The last recorded occupants were in 1860. The inscription above the grilled window says "Be sober, Be vigilant"