SecretLeeds - History, culture and architecture in Leeds

I know this is secret LEEDS but i happened to find a few interesting things on the Yorkshire coast line. Not far from my mums house, mostly WW2 defence and observation bunkers...Its a good days worth of exploring. The place is called Cayton bay.RAF Bempton, can be found on an interesting video on youtube.Anybody know of any others?Or know how to get access to such bunkers in general?

Let's keep the answers to Tyler's question within the boundaries of Leeds MBD. There is plenty of stuff within those boundaries!