As it celebrates its 25th anniversary, the museum’s success can be seen in the number of visitors it draws: around a million each year on average. And over the last quarter century, the Guggenheim has become a major hub of modern art, hosting works by artists from its home Basque region as well as international giants such as Andy Warhol, Jackson Pollock and Alberto Giacometti.

But the museum’s greatest legacy is arguably the broader impact it has had on the northern Spanish city that hosts it, a phenomenon that has become known as “The Guggenheim effect”.

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