A city official says Philadelphia needs to keep better track of its public artwork.
Controller Alan Butkovitz says a random sample of 25 pieces found that half were either damaged, vandalized, could not be located or had other inventory problems.
A spokeswoman for the city's arts office did not immediately return a request for comment.
Philadelphia cares for more than 1,000 paintings, murals and sculptures. Some pieces were created through a municipal art program, while others were donated.
The controller's audit released Wednesday found graffiti on sculptures, holes drilled in a watercolor painting and tiles missing from a mosaic mural.
The report also indicates that arts officials have not conducted periodic inspections of the collection in more than a decade.