King Abdullah Petroleum Studies and Research Centre (KAPSARC)

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by Zaha Hadid Architects, Riyadh, Saudi Arabia.

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Paris, France

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The Canadian prime minister, Justin Trudeau, the Turkish president, Recep Tayyip Erdoğan, and his wife Emine, the German chancellor, Angela Merkel, the French president, Emmanuel Macron and first lady Brigitte, arrive at a commemoration ceremony.