Mystery AtlasCydonia Artificial Monument Theory
Richard C. Hoagland's claim, developed from 1987 onward, that the Face on Mars and nearby landforms, including the 'D&M Pyramid,' are deliberately engineered monuments left by an advanced civilisation, encoding mathematical ratios and aligning with ancient Egyptian sites, and that NASA has worked to conceal the discovery.
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Related Mysteries
- Face on Marsphotographed 25 July 1976
Cydonia Artificial Monument Theory attempts to explain Face on Mars.
Theories & Explanations
Cydonia Artificial Monument Theory is frequently compared to Ancient Astronaut Hypothesis — Hoagland frames the Cydonia complex as evidence of an advanced ancient civilisation, echoing the same 'a monument too improbable to explain conventionally implies outside builders' logic ancient-astronaut proponents apply to Egyptian and South American sites.
People
Cydonia Artificial Monument Theory was popularised by Richard C. Hoagland.