Ancient Structures: Secrets Revealed

3:00 PM to 4:00 PM

Friday 25 September

Volcanic Origins

Season 1 Episode 4

How volcanic rock was used to build huge structures, including a fortress in Sri Lanka, an intricate Hindu temple, and mysterious stone heads on a remote island in the Pacific

Ancient Structures: Secrets Revealed airs on National Geographic Channel HD at 3:00 PM, Friday 25 September. (Subtitles, audio description.)

Learn more about Ancient Structures: Secrets Revealed and other education/science/factual topics on our factual page

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Education ➝ Science ➝ Factual Topics

Archaeology