The Mayans developed a complex calendar system.
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In 1908, a massive explosion flattened forests in Siberia in what is known as the Tunguska event.
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The Indus Valley Civilization built advanced drainage systems.
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The Manhattan Project developed the first atomic bombs during World War II.
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The first Paralympic Games were held in 1960.
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The 1883 eruption of Krakatoa created global atmospheric effects.
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The Olmec civilization flourished in Mesoamerica.
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In 1859, the Carrington Event caused powerful solar storms that disrupted telegraph systems.
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In 1876, a town in Kentucky reported strange lights in the sky later attributed to natural causes.
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