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Who built this extraordinarily long wall? How to build it and what purpose does it have? Those are the questions that are puzzling archaeologists.Roman army defeated 8,000km lost to China?
The Roman army was defeated before the Parthian Empire when it expanded to the east.
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- Mystery of dozens of giant circular structures at the bottom of Lake Michigan
- US ship becomes world's largest artificial reef
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Why are there no male queen bees?
The mystery of the 'doomsday' cinema, built in the desert but not a single person has visited for more than 30 years
Mystery of dozens of giant circular structures at the bottom of Lake Michigan
US ship becomes world's largest artificial reef
Wreckage of mysterious missing bomber found after 80 years
Surprised to know the identity of the Russian missile debris 'hunter'
Australia releases chemical composition data of nearly 1 million stars
NASA shuts down plasma device to save spacecraft 20.5 billion kilometers away
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