The two sides of a commemorative Greek 2-euro coin bearing an ancient Greek soldier's helmet and struck to mark the 2,500th anniversary of the 480 B.C. Battle of Thermopylae is seen during a presentation at the Bank of Greece in Athens on Tuesday, Feb. 11, 2020. Greece is planning a series of events this year to mark the anniversary of Thermopylae, when a small Greek force fought to the last man to hold a strategic pass against an invading Persian army, and the more effective sea battle of Salamis in which a Greek fleet defeated the Persian navy, killing the momentum of the invasion. (AP Photo/Petros Giannakouris)