The North Weald Redoubt fort. Fine entertainment just a few miles north east of London.
Built during the 1890s, it was one of fifteen that helped form the London defence positions. You see, during this time the Royal Navy was in a bit of bother. Doubts had been cast over their capability and those pesky French and dastardly Russians had started building warships really rather fast.
Clearly Westminster was worried. Forts were built. Apparently they contained fairly small arms along a ruddy long (and high up) defence line. It would be an ideal strategic position for artillery deployment if the worst should happen.
However, in 1905 the Royal Navy was considered back up to strength and the site was abandoned. After briefly being brought back to life in WW1 the site was sold at auction. It was used for the last time as a radio station in WW2, but, since then, has been left untouched.
The surrounding field is covered in what I can only presume is foundations for old radio towers. 
The actual fortifications were quite flooded. I opted not to get too close.
The remains of an Allan Williams turret. This could do a full 360 and was suitable for ground and air defence. It once could garrison 2 men – one to fire, one to turn the turret.
Inviting to enter right?!
