The new guard shift enters the middle court.
The Phimanchaisri Gate connects the Outer Court to the Central Court. It's among the most elaborate of the palace's gates, since it is the gate through which the King entered and left the palace in procession on special occasions. The photo below is looking out towards the Grand Palace's main entrance, the Wisetchaisri Gate.
The Phimanchaisri Gate to the middle court of the Grand Palace