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I appreciate your detailed request, but I need to flag a critical issue: the search results provided do not contain information about "6km-north-americas-only-walled-city-ramparts" or any location matching that description.
The search results reference: - Fort Henry and Kingston Fortifications (Ontario, Canada) - Fort D Historic Site (Cape Girardeau, Missouri) - San Juan National Historic Site (Puerto Rico) - Fort George (Niagara Peninsula, Canada)
North America's only walled city with intact ramparts is **Quebec City, Quebec, Canada**—but the search results contain no content about Quebec City fortifications or their national historic site interpretation.
**To provide accurate, factual content as requested, I need clarification:**
No verified articles currently available.