Under the Sforza castle in Milan, long forgotten underground passages have been revealed thanks to modern technology. These structures, described in Leonardo da Vinci's sketches, shed light on a ...

Today, L.A. Metro’s subway tunnels connect some of the city’s most densely populated neighborhoods. There are many other ...

Researchers may have found the hidden tunnels beneath a castle in Milan that Leonardo da Vinci sketched in 1495.

The Mount Washington Transit Tunnel will close for eight months to allow crews to perform infrastructure upgrades. The ...

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