Some Cave Opportunities in Kentucky
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Of course there are other options besides standing in long lines to get into Mammoth Caves, even at Mammoth Caves! When I visited there, I went early in the morning, in time for the first tours of the day. I stood in no lines and had my choice of tours. So that's one option. Another option in eastern Kentucky is Carter Caves State Park. I also visited there on the same trip, but simply took a hike around above ground, but again (and even though I was there mid-day) I saw no crowds or lines. Lost River Cave is another possibility. Owned by a non-profit, it offers tours but I have no personal knowledge of them. Then there's Hidden River Cave which is, I think, privately owned. I'm sure there are others as well.
AZBuck