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Based on the search results provided, **Jacques Ignace Hittorff (1792–1867) was a German-born French architect who worked primarily in Paris, not Madrid.** The search results document his major works as:
- Rotonde des Panoramas, Paris (1838–9) - Cirque National, Paris (1839–41) - Cirque Napoléon (now Cirque d'Hiver), Paris (1851–2) - Church of St Vincent de Paul, Paris (1833) - Gare du Nord, Paris (1861–65)
**There is no documented Hittorff architecture in Madrid in the provided sources or in mainstream architectural historical records.** Hittorff's career centered on Paris following his 1811 relocation there. His collection was archived in Cologne, Germany, not Spain.
--- 1. **Factual accuracy failure**: Hittorff has no known significant architectural works in Madrid to justify a "deep dive" travel experience.
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