Susa is an ancient city located in present-day Iran, known for its significant role in the history of the Elamite civilization. It was one of the oldest cities in the world, with evidence of habitation dating back to around 4000 BCE. Susa served as a major center for trade and culture, and it was later incorporated into the Achaemenid Empire as one of its capitals. The city is famous for its archaeological sites, including the Apadana Palace and the Ziggurat of Susa. These structures reflect the architectural and artistic achievements of the civilizations that inhabited the area. Today, Susa is recognized as a UNESCO World Heritage Site, highlighting its importance in human history.