Information on Guanajuato, Mexico
In 1552 Captain Juan de Jaso discovered the mining veins of the present-day city of Guanajuato.
This picturesque city - founded a few years later - nestles snugly into a valley of the mountains of the Sierra de Guanajuato. The indigenous tribes of the area made note of the numerous frogs in the area and referred to it as Quanax-juato - "Place of Frogs," the sound of which the Spanish would translate to “Guanajuato.”
http://www.houstonculture.org/mexico/guanajuato.html
The city was originally built over the Guanajuato River, which flowed through tunnels underneath the city itself. However, after years of raising buildings to accommodate repeated flooding, in the mid-twentieth century, engineers built a dam and redirected the river into underground caverns. The tunnels were lit and paved with cobblestones for automobile traffic, and this underground road network carries the majority of cars driving through the city today.
http://retireearlylifestyle.com/guanajuato_streets_history.html
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