The fully decorated Propylaea takes care of the height differences at the entrance to the Acropolis, and impresses those entering through. It is interesting that the gate was never fully built. In the 17th century, it was actually badly damaged by canon fire, and still managed to maintain its impression.
Notice on the left side, before the entrance, the Monument of Marcus Agrippa. He was the deputy, partner in power and the beloved son-in-law of Emperor Augustus. Up until his untimely death, Marcus Agrippa was the successor for Emperor Augustus, and even married his shrewd daughter, Julia. History tells that the known Marcus Agrippa was loved by the commoners, however, the Roman nobility disliked and were jealous of him, he himself ordered this monument to be erected, as if the people of Athens adored him and erected this statue for him.
The assumption is that the Propylaea was built over an earlier entrance, whose structure or size is unknown.
Most of the columns in the Propylaea are in the Dori style. Only the middle columns, the taller ones, are Greek-styled columns. There is an explanation that they were built in this style, so as not to look to messy.
The meaning of the name Propylaea is in the combination of pro - meaning "before" and "pylaea" which means "columns." This combination was first given to this Propylaea, the entrance gate of the Acropolis in Athens, the one you see here.
Later, the term was used in other places, since its meaning is simply the "gate." Indeed, the Propylaea buildings were erected in antiquity in many places. Among them were profiles in ancient sites such as Mycenae and Baalbek.
Interestingly, modern architecture continued to use the principle of the Propylaea of the Acropolis in Athens. The Brandenburg Gate, perhaps the most well-known building of Berlin, is a Propylaea structure based on the historical structure here.