Collection of facts about the Achaemenid Empire

This post is a collection of facts about the Achaemenid Empire (550 - 330 BC). There are 6 facts listed below. Source: Wikipedia

• Founded by Cyrus the Great (550 BC)
• Based in modern-day Iran
• Defeated Medes, Lydia and Neo-Babylonian Empire
• 5.5 million sq. kilometers: Balkans, Egypt, West Asia, Central Asia, Indus Valley
• Conquered by Alexander the Great and Macedonian Empire (330 BC)
• Later ruled by Ptolemaic Kingdom and Seleucid Empire