This is place from the Paris Games Week 2015 game trailer. I don’t know if it was available for other players to visit but it’s not accessible now.
Better check this 
Capital city
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This was on one of the old servers and was primarily built by one player (Nyuudles) when we had infinite blocks and rapid firing grapples. It’s not available to view anymore.
The Paris Games week city was built by Everbloom Studios specifically for the trailer. It was made available on the test servers for a short time, but was later replaced with a snapshot of the live servers, so that actual game world data could be used for testing releases.
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I would like to go there (
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You may get your chance some day! These worlds still exist and are some times rolled out for promotional purposes.
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