What it is known for sure is that in 1509, according to the recordings, Shinkyo was a drawbridge, which makes it the oldest bridge in Japan built over a gorge. Shinkyo was rebuilt many times and in 1636 it took the form we see today, but without decorations, which were added in 1792.
Originally, only the Emperor, a few generals and imperial messengers were allowed to cross Shinkyo. Since 1973 the bridge is opened to the public and now everyone can enjoy a view like this one:
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 18mm
Aperture: F/5.6
Shutter Speed: 1/60s
ISO Sensitivity: ISO 200