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Google can be your friend , found an old fort one day /out/ , got home googled it and found out they built ten of them during the Napoleonic wars to defend an estuary against invasion , explored all of them , this then led me to other bunkers that were built in ww2. It was cool camping in them (the ones that were structurally sound looking )
But you would be surprised what you find on Google when you put in a certain area , like board posts by other people who found stuff .
One of my favourite spots now I found that way , it's an island with a fort and the ruins of a castle , the guy that lives there owns the island and has a farm on it. First day I arrived on their he came out with a pack of dogs and a shotgun. Got talking to him , completely chill guy , just has lots of problems with assholes coming onto his land. Gave me permission to camp / fish whatever on his island whenever I want as long as I don't leave shit behind me.
Found a tunnel on that island when the tide was out one day , brought some other sc/out/s with me and did some exploring. Led to a sub level of the fort , found old barrels , pipes , bowls etc , was pretty cool.
Looking for a new area now tho further away , a dude here is after writing a book about abandoned structures , can't wait to get going to these places