Scientists left baffled as mysterious columns of coloured light appear in the night skies
Belize's great Blue Hole
The Volcanism Blog
Lost Crusaders' Tunnels Found Near Palace on Malta
The Ancient World's Longest Underground Aqueduct
World's Most Impressive Explosions of Lava
8 Most Fascinating Natural Wonders
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Nazca Lines and Culture
The Pyramids of China
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Rainbows take many forms. Multiple bows, bows that cross, red bows, twinned bows, coloured fringes, dark bands, spokes and more.
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