The UnXplained (2019)

S05E01 Lost Cities

For ages, archaeologists and adventurers have been captivated by the quest to uncover ancient cities that have vanished over the years. Some of these locations are documented in historical writings, while others exist solely in myths and legends. What causes a once-flourishing civilization to fade into obscurity? And if their remains are discovered, what hidden truths could they unveil about humanity's past?