The Ring of Isengard as the War of the Ring left it: the black tower of Orthanc standing untouched — complete with full interior — amid broken walls, flooded pits and industrial works, with Fangorn Forest pressing close, Ents among the wreckage and eagles circling overhead.
One of our earliest showcase builds, and still one of the most atmospheric. Free to download for Java and Bedrock with the Legacy resource pack.