Kalundborg is a city in Kalundborg municipality in Denmark and the site of its municipal council. Kalundborg is very well known as the location of a large broadcasting facility, the Transmitter Kalundborg. There is also a large coal-fired power station at Kalundborg. Kalundborg is mainly a trading and industrial town, but it is also well known for the beautiful five-spired church which is closely associated with King Valdemar I and the famous Archbishop Absalon. The church itself is said to be built by Absalon's brother Esbern Snare.