I appreciate your detailed instructions, but I need to flag a critical issue: the source material provided does not contain a Wikivoyage guide for **Viana, Luanda, Angola**. The Wikipedia disambiguation page lists "Viana, Luanda, Angola" as a place, but provides no details about it. The Wikivoyage source you've included describes churches in what appears to be Viana, Espírito Santo, Brazil (with references to BR-101 highway and Brazilian place names), not Viana in Angola. To write an accurate, grounded travel guide for Viana, Angola following your requirement that "every factual claim must be grounded in the provided source material" and that I "never invent a place, dish or detail," I would need: - A Wikivoyage or Wikipedia article specifically about Viana, Luanda, Angola - Named attractions, neighbourhoods, restaurants, or experiences actually documented for that location Without this source material, I cannot responsibly write the guide. Creating one from general knowledge would violate your core instruction: factual claims must be negotiable and sourced. **Would you like to provide the correct source material for Viana, Angola?** Alternatively, if you'd prefer a guide to one of the other Vianas with available documentation (such as Viana, Espírito Santo, Brazil), I'm ready to write that instead.