Dover Abandoned Underground Fort

This is my entry to the abandoned shit weekly contest.
A few months back, we went to stay with a good friend of ours. She took us to an amazing abadoned fort in Dover and cave on the side of a cliff (very dangerous place).
The fort was huge, and you had to have a ladder to get up the wall, and then climb through a window almost smaller than me...
On the way up the wall, a group of 3 young children emerged from the undergrowth and begged us to use our ladder, and as time progressed, we soon had a entire school trips worth of kids following us around.
Very surreal but amazing experience, can't believe something an incredible as this is just walked over the top of and left to rot.

And here are a couple of snaps of the old cave that led to an old arm bunker hidden away in Dover cliffs! It was not far from the fort, within walking distance. Not sure if same site.