It's gotta be Dreaming City for me. The scenery, the music, the secrets, and the story all top tier. Shattered Throne is a whole vibe and Last Wish is the best piece of Destiny content Bungie has made IMO. Sound off on the places and scenery that you love to explore in D2!
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Nessus is their masterpiece, nothing else comes close. I was shocked to see last place after I voted. Weird.