PARIS (AP) — The Louvre, the world’s most-visited museum and a global symbol of art, beauty and endurance, has withstood war, terror, and pandemic — but on Monday, it was brought to a halt by its own striking staff, who say the institution is crumbling under the weight of mass tourism.

The Louvre Museum in Paris, home to the Mona Lisa, unexpectedly shut down due to a staff strike, leaving tourists stranded. Workers cite unbearable conditions from mass tourism, understaffing, and neglected infrastructure.

The Paris museum has become a symbol of tourism pushed to its limits. Workers point to unmanageable crowds, chronic understaffing and what one union called “untenable” working conditions.

The Louvre Museum closed its doors on June 16. Many visitors were left confused outside as they waited to visit the place.

On Monday morning, tourists flocked to the Louvre, eager to see the Mona Lisa, the Venus de Milo, and thousands

In the wake of that growing movement, workers at the Louvre reportedly spontaneously decided to walk out during a standard staff meeting on Monday, per the AP. Gallery attendants, ticket takers, and security all refused to operate their posts, complaining that the crowds have become unmanageable and the museum is understaffed.