See https://commons.wikimedia.org/wiki/Category:Files_with_404_errors
Error retrieved from the server:
404 error: File not found
The URL you requested was not found. Maybe you would like to look at:
The main page The list of Wikimedia downloads
A project of the Wikimedia foundation.
Files were not deleted by admins. The got lost by some technical defect?
Version: unspecified
Severity: critical
URL: https://commons.wikimedia.org/wiki/Category:Files_with_404_errors
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=41361
https://bugzilla.wikimedia.org/show_bug.cgi?id=24417
https://bugzilla.wikimedia.org/show_bug.cgi?id=69362