North Shore (Chicago) - Wikipedia

File:Chicago, North Shore and Milwaukee 756 at Fox River Trolley Museum on Aurora Elgin and Fox River Electric (AE&FRE) trackage, South Elgin, IL in July 1966 (25973520736).jpg - Wikimedia Commons

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Can anyone in the US show me a suburban sprawl with huge houses

Gold Coast Historic District (Chicago) - Wikipedia

North Shore Sanitary District Tower - Wikipedia

North Shore (Illinois) – Travel guide at Wikivoyage