A sinkhole unlike some, methinks

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I’ve heard of sinkholes but Umpherston Sinkhole near Mount Gambier in South Australia doesn’t fit the usual description of this geological process. The sinkhole was once a cave but the top of the limestone chamber collapsed. In the late 1800s, James Umpherston, a local landowner, began creating a sunken garden, adding stone walls, stone steps and exotic plants. Vines hang down the sides of the hole and there are viewing platforms at the top. The garden is sheltered and cool, and a microclimate has been created. Hydrangeas grow well there. It’s a popular place with tourists and locals alike and in the evenings the little native creatures come out of hiding. I haven’t been there, but the council is about to give the area a major facelift. I hope they don't spoil. It sounds a delightful place. The photo is from Wikimedia, courtesy Thom Devereux.