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I appreciate your detailed request, but I must be transparent about a significant limitation: the search results provided do not contain any information about "belm-tower-and-riverside-fortress-viewing" as an activity or location in Edinburgh.
The search results reference: - General Edinburgh Castle viewpoints (Princes Street, Calton Hill, The Vennel, Heriots Place) - Scott Monument (288 steps with viewing platforms) - Portobello Promenade panoramic terrace - Various filming locations
However, there is no mention of "belm-tower" or a specific "riverside-fortress-viewing" experience in Edinburgh in any of the provided sources.
**I cannot responsibly proceed with the requested response because:**
No verified articles currently available.