Changing the Guard (often incorrectly referred to as the Changing of the Guard), refers to a formal ceremony in which sentries providing ceremonial guard duties at important institutions are relieved by a new batch of sentries. The ceremonies are often elaborate and precisely choreographed. In the state capital, Athens, members of the elite Evzones light infantry unit, provide a 24-hour honor guard, with an hourly guard change, at the Presidential Mansion and at the Tomb of the Unknown Soldier, off Syntagma Square at the foot of the Hellenic Parliament. The Changing the Guard at the Tomb of the Unknown Soldier in particular has become a tourist attraction, with many people marvelling at the guards, who stand motionless for two 20-minute intervals, during their 1 hour shifts. Greek soldiers called "Evzons" or 'Tsoliades' in their traditional pleated skirt uniform and shoes with toes tipped by a red or black ball called a 'foonda' are who guard the tomb. Athens is the capital and largest city of Greece. It dominates the Attica periphery and is one of the world's oldest cities, as its recorded history spans around 3,400 years. Classical Athens was a powerful city-state. A centre for the arts, learning and philosophy.