I made my way to Bidston Hill yesterday on the recommendation of a report I saw on here. What a gorgeous place! The whole land was bought on the condition that it would be kept for public use and enjoyment, which is upheld today. The buildings date from the 1800s. No interior exploration as the mill is sealed tight (but it is open to the public from April so I will definitely be going back). The observatory and lighthouse were occupied, so they were a no go too. The views from the hill are spectacular, you can see out across the Irish Sea, or can look across to Liverpool. Definitely recommend as a place to visit with your kids if you enjoy exploring with them (which is what I did).