Guards will be posted at Wellington's Botanic Garden after a Friday night party left a WW1 memorial sculpture damaged and litter and broken glass strewn around Remembrance Ridge.
Pieces of the memorial sculpture Victory Medal, by artist Helen Pollock, have been broken, Gardens manager David Sole said.
The sculpture of 36 pairs of feet on a rusted steel medal has had some of the toes broken, but Sole was unsure whether it was intentional, saying it could have happened if somebody had been "mucking around" on the sculpture.
There were signs up asking people not to climb onto the sculpture, he said.