The gate was recently restored and, unlike the rest of the Senso-ji buildings, which are lit in yellow, the Nitenmon Gate is lit in red and purple... which makes the two guardians look even more menacing...
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 22mm
Aperture: F/7.1
Shutter Speed: 2s
ISO Sensitivity: ISO 320