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Ancient Engineers Understood Science, Monument Proves
In the heart of southern Spain lies the Menga Dolmen, a 5,600-year-old megalithic monument that poses an engineering enigma ...
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World's Largest Underwater Cave Discovered - National Geographic
Explore the World's Largest Underwater Cave January 17, 2018 - The world's longest underwater cave has been discovered near the city of Tulum, on Mexico's Yucatán Peninsula. The new discovery ...