 Glasgow became one of the first cities in Europe to reach a population of one million.The city's new trades and sciences attracted new residents from across the Lowlands and the Highlands of Scotland, from Ireland and other parts of Britain and from Continental Europe.During this period, the construction of many of the city's greatest architectural masterpieces and most ambitious civil engineering projects, such as the Milngavie water treatment works, Glasgow Subway, Glasgow Corporation Tramways, City Chambers, Mitchell Library and Kelvingrove Art Gallery and Museum were being funded by its wealth.