The three islands in today's photo were built then, and the impressive collection of rocks was added during the period of the eighth Tokugawa shogun, Yoshimune.
EXIF info:
Nikon Df
Lens: 24-70mm F/2.8G
Focal Length: 24mm
Aperture: F/6.3
Shutter Speed: 1/1000s
ISO Sensitivity: ISO 800