The Louvre, the world’s most-visited museum and a global symbol of art, beauty and endurance, remained shuttered Monday — not by war, not by terror, but by its own exhausted staff, who say the institution is crumbling from within.

A museum in Italy has urged visitors to “respect art” after a pair of tourists fled when they shattered a priceless sculpture of a chair by posing for a picture on top of it. The so-called “Van Gogh chair,