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 ...

A replica of Garrett Morgan’s three-way traffic signal invention from 1923 on display at the Western Reserve Historical ...

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.

There can be much debate on whether a site was part of the Underground Railroad. Hudson Valley has its share of sites, ...

A South Carolina ghost story could have a very earthly explanation. Starting in the 1950s, folks in the Summerville, S.C., area began reporting sightings of strange balls of light floating down a ...

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