One of Greece’s most significant archaeological sites, Ancient Messene is also renowned for the impressive ruins of its monumental fortification - the 9,5 km long circuit wall flanked by towers at regular intervals with two main entrances, one of which is the Arcadian Gate. Large rectangular limestone blocks were used for its construction quarried on the spot on the rocky body of Mt. Ithome which at places preserves evidence of ancient quarrying activity.

The city wall was 9,5 km long and 7 to 9 metres high. It was fortified by 30 square or horseshoe-shaped guard towers with doors admitting passage to a protected walkway on top of the wall. The wall was pierced by two main gates flanked by protective structures. Through the Arcadian Gate to the north ran and still runs the main road north (to Arcadia), currently from Mavrommati.

The Arcadian Gate and adjacent section of the wall up to were restored from 2003 to 2005.