Hoddesdon is a commuter town the English county of Hertfordshire, in the midst of the Lea Valley. The city grew rapidly as it was a post station on the route between Cambridge and London. The highlight in the Post Office was achieved in the 18th century, when more than 35 stagecoaches a day passed through the city. The city experienced in the mid-20th century an upswing through the extraction of gravel deposits that were exhausted in the 1970s. The lakes and gravel pits formed were used for public leisure facilities at Lee Valley County Park. Today Hoddesdon is a city of light industry, but essentially residence for commuters to London. The city is also home to the eighth Congress of the International Modern architecture since 1,951th