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 crystal-covered chair inspired by one of Vincent Van Gogh’s most famous paintings was seriously damaged when a tourist sat on it while posing for a photograph, according to the Italian museum where the artwork is on display.

The Louvre, the world’s most-visited museum and a global symbol of art, beauty and endurance, remained shuttered most of Monday when staff went on strike in frustration over what they called unmanageable crowds at an institution crumbling from within.