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Wartberg im Mürztal is situated at an altitude of 584 m in the valley of the river Mürz.

The earliest mention of a manor "ad Wartperch" dates from 1158. At this place a hill or low mountain (in German: 'Berg') narrows the valley so much that a fortified lookout tower (german: 'Warte') could easily control the road that lead along the river and here had to climb up and down this hill.

The parish church Sankt Erhard [centre left] was first mentioned in 1407 as filial church of Krieglach and became a parish in 1785. The present church was built 1730–1731 by the architect Remigius Horner on the model of the abbey church of Pöllau. After a fire in 1735 the church tower was rebuilt in 1737.