The trend now is for concrete reproductions of donjons to be demolished and replaced by traditional wooden ones. One such project is under way at Nagoya Castle, which was gutted in a 1945 air raid.

However, after decades of wear and tear, plus a need for further earthquake-proofing, the Nagoya City Council has decided to rebuild the castle keep. Moreover, to emphasize its historical value, the ...

And new plans have revealed the new kids playground set to open on the grounds. Designed by UK play specialists Greenspan, the 10m wooden castle will have rope bridges, slides and puzzles.