20 years ago, the Ness of Brodgar archaeological site was uncovered, revealing an ancient city on Orkney. But it will be reburied this year to protect it. The article says that it is a UNESCO site but the site is degrading so they want to protect it for the future, when there might be better technology to investigate more. So if you’re going to Orkney this year, you might want to check into this as I believe the reburial will take place later this year.
https://www.dailyrecord.co.uk/scotland-now/ancient-scottish-city-you-tiny-32623697.amp