>>418053407
there's a ton of those, to name a few really great once quickly: Primal ValleyBy Xeverian (quests mostly don't work as it's made on sdk 2, but astonishing surronding is still there), The Abandoned City By Sournetic (i'll make review on that in a future, just go on roof and wait for a show), and probably Victory Mine | Universal UnionBy Tommy Coolatta (a giant atmospheric mineshaft from Half-life, incredible port).
Separately i would hightlight not single maps, but actual authors, from whom i recommend to just visit all their maps:
Karl Kroenen, who's map review you just saw - very abstract, but very curious to see what he comes up with;
nobelchoco, who's map Soglio village review was few days ago, i'll add picture from it here - all of his photoscanned worlds are breathtaking and of a big scale to exlore;
And last but not least - DrMorro, this guy don't even need introduction - his worlds are so great at this point everybody at least heard about them, so stuff like Olympia, Moscow Trip, ORGANISM and of course Epilogue․ Chapter 1 is a must to visit for that type of request!

>>418054092
Have fun exploring them, as always i'm glad to help!