"Ru" Gate

The entrance to the gate from the outside is low and the exit is high. We climb up the stairs to pass through, and we must make a sharp right turn. Viewed from the outside, it is "Burying Gate"(Uzumi Gate), when viewed from the inside, it is called "Tunnel Gate" (Ana Mon).
As this gate served a tactical purpose, it is also said to have been the gateway of stealth which the spies got into and out of.

Photo of "Ru" Gate