Yep - that's the one!
I may- but I don't have a clue what a fireplug is? :s
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Ah... never heard the expression fireplug! We just refer to them as fire hydrants - you learn something every day ;) Yes, was in the neighbourhood, so went to see the giant plug!
The first pic just "had the look" of the more lush, verdant Midwest of Eastern US, and the sinkhole topography was evident.
But, sinkholes occur lots of places, and given that our friend the bison is present, seeing the coniferous trees and duff, and given it's a "park", I move my guess to Carlsbad, NM.
Foy
I would move it farther north -- I am guessing Wind Cave in Wind Cave National Park in South Dakota.
Mark
Yes, it's an entrance to Wind Cave. The "Natural Entrance" tour enters the cave here and takes the elevators out. The revolving door was installed to limit the moisture escaping from the cave.
The group in the photo was on a wild cave tour that normally takes the elevator into the cave before crawling off into the dark. But on this day, both elevators had stopped working. The cave had been evacuated and closed down except for this tour. We had the fourth longest cave in the world to ourselves.
How about this one, folks?