The UnXplained: Season 6, Episode 3

6 - 3: Secrets of Ancient Structures

Scattered across the globe lie mysterious ruins that are buried in sand-swept deserts, perched atop towering mountains, and shrouded in the heart of dense jungles. These age-old structures stand as silent sentinels from the past, their true history seemingly erased by time. Can modern archaeology unravel the enigma of how--and why--these wonders were built?