The secret underground passages sketched in Leonardo da Vinci’s notebooks have finally been found — beneath Milan’s Sfo…
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The secret underground passages sketched in Leonardo da Vinci’s notebooks have finally been found—hidden beneath Milan’s Sforza Castle. A team from the Polytechnic University of Milan, working with the Sforza…
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In 1988, Japan opened the Seikan Tunnel, then the longest tunnel of its kind in the world, stretching 53.85 kilometers with 23.3 kilometers laid underwater. In 1994 the Eurotunnel opened…
