In the late 1920s, architects E. Lazaridis and E. Dimitriades Rok designed the Monument of the Unknown Soldier, with the relief on the marble tomb sculpted by Konstantinos Dimitriades. During the initial phases of construction, extensive excavation was undertaken in front of the parliament building, lowering the ground level to the level of Amalias Avenue.

Heavily influenced by ancient art, the monument has a strictly minimalist design. The monument is guarded day and night by the Presidential Guard of Evzones, and hosts a ritual wreath-laying in honour of the Unknown Soldier.