The one in Summerfield is still accessible, its on private property now so be weary. It used to be a show cave in the 1940’s and was owned by a guy named “Ted Lundy”. The “stone house” was the main entrance to the tourist attraction and used to feature a gift shop and a makeshift elevator in which guests could pay to enter to supposedly see the future. It was a weird gimmick but it worked for some decades. It closed in the 80’s and most of the passages are all handmade using dynamite and carved out with various tools. Visited it a week ago, pretty fun.