The Koko-en can be easily visited, being located nearby the Himeji Castle, on the place of the former lord's west residence. Its location also inspired the name of the largest and most impressive part, Oyasiki-no-niwa, the "garden of the lord's house", photographed here...
EXIF info:
Nikon Df
Lens: 24-70mm F/2.8G
Focal Length: 24mm
Aperture: F/5.6
Shutter Speed: 1/640s
ISO Sensitivity: ISO 800