8 mile rock in Utah. There have been three caves dug out of the rock, and then fronted with a concrete wall with a door and windows in them. This is a well known stop, and it is actually listed on at least one well selling trail guide. You can drive right up to it and explore, but beware. When we looked in the middle cave, there was a bed with some old dirty linens on it, a shelf of canned goods and dirty boots and clothing strewn about in a way that showed someone was occupying it. I suggest approaching with caution!