Curved, terraced Antartic mountain face. Source (Russian) English

Curved, terraced quarry face. Source (Russian) English

Cheddar Gorge, Somerset, England. Source

This Cheddar Gorge image is a from a page about Gough's Cave and its association with cannibals. For more British caves with cannibal associations, see How Do You Get AI to Think for Itself - Part Three.

Unexplained Skaraguta canyon, Sweden. Source

Local folklore says 20m deep Skaraguta canyon was inhabited by trolls.

Video clips:

Strange-shaped boulders explained. Source: Earth, The Giant, Ancient Mine

Unnatural caves. Source: Earth, The Giant, Ancient Mine

Terraced hills are the sides of quarries. Source: Earth, The Giant, Ancient Mine

Petra's vitrified walls cannot be rain erosion. Source: Earth, The Giant, Ancient Mine

Unnatural underground rivers. Source: Earth, The Giant, Ancient Mine

Metro Cavern, Zion National Park, Utah. Source: vel24.livejournal.com

The Metro Cavern complex is 10km long. Access to many parts is restricted. More details at vel24.livejournal.com.

Spoil tips with molten cores. Is Earth a mine? Source: Earth, The Giant, Ancient Mine

Or is Earth a leisure park built in a former quarry?

More:

• Investigations into quarried Earth

• Investigations into terraformed Earth

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