There are two Ninja groups in Japan, One is Iga in Mie prefecture and another is Koga in Shiga prefecture. Koga Ninja house is not replica but real Ninja's estate! It looks like ordinary traditional Japanese house, however, varios tricks are hidden all over. Exibithion space is smaller than Iga's one. I recommend people should visit both houses. Iga and Koga Ninja houses place a few hours drive away from Kyoto.