I was torn between visiting Himeji and Mt. Koya, but the forecasted rain made it a no brainer to go to Himeji.Himeji CastleHimeji Castle is the largest and most visited castle in Japan. If you are staying in Kyoto or Osaka, Himeji is easily accessible, making this a fantastic day trip to consider. The castle is simply wow. The bright white paint and intricate, ornamental designs that adorn the building are truly impressive and make it an architectural jewel.