Baden (in local dialect: [b̥ɑːd̥ə]) is a municipality in the canton of Aargau in Switzerland and the capital of Baden district. The city is located in the densely populated Limmattal, 21 kilometers northwest of Zurich, 22 kilometers northeast of the cantonal capital Aarau and 18 kilometers south of the city of Baden Waldshut-Tiengen (each distance). Within the metropolitan area Zurich Baden is the center of a major Subagglomeration with around 100,000 inhabitants. The city itself has a population of over 18,000 inhabitants; it is therefore for the adjacent community Wettingen, to which it is geographically and economically intertwined, and Aarau is the third most populous municipality in the canton. As a founding place of Brown, Boveri & Cie. (Now Asea Brown Boveri) and important of the GE group's location (2015 Alstom) is an internationally important center of Baden electrical engineering sector. The history of Baden dates back to the 1st century. AD. Back when the Romans began to use the hot springs in the former Aquae Helveticae. In 1297 the formal city foundation was carried out by the Habsburgs. The Confederates conquered the city in 1415; Baden until 1798 was a vassal town, but had a prominent position as a health resort and most important meeting place for the federal Tagsatzungen (until 1712). At the time of the Helvetic Republic Baden was capital of the canton of Baden, since 1803 the city in the canton of Aargau.