I was looking up music for various artists recently, and in an effort to find CDs, I came across the website for the pop artist Jai Paul:
https://jai-paul.com/It's not super active anymore, but it's got merch and info scattered around a 3D world that you can look at by clicking on it. The design firm that made it, Bureau Cool, says that when there are multiple people signed in to the chat room, you can see where they are in the world (see screenshots on page below):
https://bureau.cool/work/jai-paul-digital-spaceI think it's pretty neat, although because it's limited in scope to advertising materials, the 3D world aspect of it isn't utilized as much as it could be. I figured I'd show it off here in case it inspires anyone for their own projects.