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

Tourists hoping to visit the Louvre this morning were left frustrated when, without warning, the Paris museum remained shuttered well past its scheduled opening. As one American visitor told AP, the scene was a “Mona Lisa moan,