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There is no obvious way to get back out since patch 1.5 and there is nothing to collect, but you can explore one of the flashback locations. A lot of climbing is involved which is made easier if you have the Epic Fortified Ankles from Fingers equipped.
The Atlantis is a little different depending on where you are in the game. Prior to the second Johnny flashback (the one where you save Alt), one of the areas is closed off but it is possible to take the elevator up or down. After the second flashback that area is accessible but the elevator will only go down.
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Only dreaming here, but I hope they would make these places more like easter eggs with Phantom Liberty. As in, they would be accessible, and possible to get out from, by normal means, but not advertised or hinted to, in any way in the game. And when you find this kinda place, that dates back 50 years, Johnny would have cool comments or little bits of memories to tell 🙂
Oh my, that’s headless V, now I’m scared 😅