$56 million sounds right as security guards carry machine guns when we were at

[theking]

...the Louvre. Different place but some of these art pieces have very high value:

Child Damages $56 Million Piece of Art and Museum Offers Family a Return Visit

A celebrated painting by American abstract artist Mark Rothko has sustained minor damage after a young visitor made unintended contact with the artwork during a trip to the Museum Boijmans Van Beuningen in Rotterdam, the Netherlands. According to Euronews, the piece in question, titled Grey, Orange on Maroon, No. 8 (1960), was “scratched” in its lower portion after what the museum described as an “unguarded moment.” The institution confirmed that the damage occurred when a child touched the unvarnished surface of the canvas while the painting was on display.

Took these photos at the Louvre and security is no joke: