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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Back when I was a wee lad of 14 I would just spend hours at a time shooting in The Divide on the Cosmodrome. Now I make sure to get bounties done there as much as I can.