The secret underground passages from Leonardo da Vinci’s notebook have finally been discovered! They were hidden beneat…
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The secret underground passages from Leonardo da Vinci’s notebook have finally been discovered! They were hidden beneath the Sforza Castle in Milan. A team from the Polytechnic University of Milan,…
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In 1988, Japan opened the Seikan Tunnel, which at the time was considered the longest structure of its kind in the world, stretching 53.85 kilometers, with 23.3 kilometers laid underwater.…
