Recently, The Guardian has compiled 25 stories to share them with its readers in lockdown, who now have more free time to read. The vocabulary and grammar they use is first class, there are many descriptive words that advanced students need to become familiar with little by little. In this list of 25 articles, there is a wide range of stories: the recycling of oil rigs, the work of a special sound effects engineer in Hollywood, the Fifa video game, a real spy story, ethical wine making, the first sex robot, the casting director of "The Game of Thrones"... Some of these reports can be heard on an audio podcast.
As the articles are long, rich in language and very thorough, this reading could be classified as C2. I would like to thank my colleague Isabel A., who passed me the link.