Kladno  is a city in the Central Bohemian Region  of the Czech Republic. It is located 25 km northwest of Prague. Kladno is the largest city of the region and holds a population together with its adjacent suburban areas of more than 110,000 people. The city is part of the Prague metropolitan area.The first written evidence of Kladno dates back to the 14th century. In 1561 the city rights were secured. Kladno was the historical birthplace of heavy industry in Bohemia. For years, the town was home to the Poldi steel factory, the region's largest employer. The factory still stands but has been divided into smaller entities after privatisation and changes in ownership. The mining industry began here in 1842. The proximity to Prague helped to keep the local economy stable in spite of the heavy industrial decline after the collapse of the communist regime.Source: Wikipedia