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EntertainmentCNN praises Vietnam's 'Underground City': One of the most fascinating in the world!
Vietnam's Cu Chi Tunnels make the list.March 13: The world's longest undersea tunnel inaugurated
The Seikan Tunnel is a 53.85 km railway tunnel in Japan, with a length of 23.3 km underground.
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Why have there never been any bird droppings on the roofs of the Forbidden City in the past 600 years?
After being continuously heated for 270 days at over 1,000 degrees Celsius, the GRX-810 material remained unharmed: What is the secret?
The loneliest robot in the universe - 'real-life WALL-E': 15 years wandering in endless space.
Debunking Space Myths: Questions Surrounding Nebulae!
14 of the most powerful armies in ancient world history.
12 of the most terrifying venomous spiders to humans.
10 harmful effects of eating dog meat that not everyone knows about.
Who should and shouldn't get the Pfizer vaccine?
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