The original palace was built at the beginning of the Heian Period (794 - 1185AD), a period when the Chinese architecture was quite common in Japan. Actually, the entire Heian-kyō city was inspired by the Chinese capital of the Tang Dynasty (618 – 907AD), Chang'an.
EXIF info:
Nikon D90
Lens: 8-16mm F/4.5-5.6G
Focal Length: 16mm
Aperture: F/5.6
Shutter Speed: 1/250s
ISO Sensitivity: ISO 200