Five landmarks that could use largesse

Within hours of the devastating fire at Notre Dame in April, three French billionaires (Bernard Arnault, Françoise Bettencourt Meyers and François Pinault) and an American (Henry Kravis) pledged almost $700 million to help restore the Paris cathedral. Over the past few years, it has become increasingly common for tycoons with monumental fortunes to donate to monuments in need.

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