Its arch is cracking and its vast pavilions lie empty, but the crumbling Rachid Karami International Fair in Lebanon's port city Tripoli now has hope of revival, having been added to the United Nations' list of world heritage sites in danger. Designed by Brazilian architect Oscar Niemeyer in 1962, the collection of structures on the 70-hectare plot is considered one of the key works of 20th century modernism in the Middle East.

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