Pëtr Kropotkin wrote a lot about possible organisation of anarchist society after the revolution, at this point it’s a meme to recommend reading “the bread book” The Conquest of Bread and I don’t personally recommend starting with it and instead beginning with a pamphlet like Anarchism and Revolution.
The ZAD de Notres-Dame-des-Landes, is a good example of a long running commune that has managed to withstand assault from an external state. But the kinds of large scale anarchism that will do away with the state in its entirety has not yet been attempted.