The Nagoya Municipal Government on Friday took the unusual step of warning tourists that they enter Nagoya Castle's tower at their own risk due to the building being in danger of collapse in a strong earthquake.
The city said it installed the three signs within the castle grounds as concrete in the multistory building is degrading and lacks resistance to temblors.
The idea of the warning signs came from Mayor Takashi Kawamura, who is frustrated with a lack of progress on restoration works due to opposition from the city assembly.