This is a Ryōbu type torii (a gate with four legs) and it was built in 1951, in commemoration of the Peace Treaty signed by Japan with 49 nations, to formally end the World War II.
EXIF info:
Nikon D300
Lens: VR 70-300mm F/4.5-5.6G
Focal Length: 180mm
Aperture: F/7.1
Shutter Speed: 1/500s
ISO Sensitivity: ISO 320