Built around the enigmatic ruins of Angkor Wat, the Khmer Empire once dominated Southeast Asia, but its sudden collapse in the 15th century remains one of history’s great puzzles. Lucas and Luna guide listeners through the empire’s rise under Jayavarman II, its golden age under Suryavarman II, and the gradual unraveling that followed. They examine the religious shift from Hinduism to Theravada Buddhism, the massive water management system that sustained Angkor, and the environmental stresses—droughts, floods, deforestation—that may have triggered its downfall. The show delves into the sacking by Ayutthaya in 1431, the abandonment of the capital, and the migration south to Phnom Penh. It also explores modern debates: was the collapse sudden or a slow decline? How did climate change and infrastructure failure intersect with foreign invasions? And what can the Khmer Empire’s fate teach us about resilience and vulnerability in our own era of environmental change?