Updated: May 10
In Season 9, some artifact caves will be allowed to be built in. Please refer to the below images to know which caves are allowed or not. Green star for Allowed, Red Star for No Building.
To view the caves in more detail, refer to this link: https://ark.gamepedia.com/Caves
*Please note you cannot prevent access to or build in areas leading to the Jump Puzzle cave - however you can build inside Spider Cave and Puzzle Water Cave.
*Oil Cave & Waterfall Resource Cave will be allowed to be built in also
*The OP Tree in Aberration Zone on Valguero will be blocked
*The Green Obelisk cave will be blocked *Lava cave is not allowed to be built in