The simplest type of kairo is called tanrou, a single corridor with the width of about 2 meters (1 ken). Here is one of the most famous such corridors, the tanrou from Kasuga Taisha in Nara, decorated with the most beautiful bronze lanterns I have seen, all donated by worshipers.
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 18mm
Aperture: F/5.6
Shutter Speed: 1/40s
ISO Sensitivity: ISO 200