It is a monumental gate with three extended archways which was dedicated to the Roman emperor Hadrianus. The two sides which have survived through the present day as undamaged lean against the walls of citadel. In 1960 it was restored.
There are Korinth style ( There are two or three rows of akanthus leaves on its lower and middle sections and there are helixes on the upper section which form volutes at the corners. This style of heading is the one most preferred in Roman monuments ) columns on both sides of the building and at the points corresponding to the rear sections of the arches, placed towards the outside of the building.
All these columns are connected to the main structure by the lentos. Epistylos ( the upper part of the columns ) fingers of the arches and inside of the arches all bear rich decorations.