Altena is a town in the district of Märkischer Kreis, North Rhine-Westphalia, Germany. The town's castle is the origin for the later Dukes of Berg. Altena is situated on the Lenne river valley, in the northern stretches of the Sauerland.
Wikipedia https://en.wikipedia.org/wiki/Altena
Official Website http://www.altena.de/
Coordinates 51°17'56.495" N 7°40'24.542" E
