It is important to distinguish between present-day Austria and the Austrian and Austro-Hungarian Empire of the past.
Many "Austian" towns and provinces are no longer part of Austria and many probably bear different names today. If you are not sure, check using any of the fine place finder resources. In some cases provinces have been re-defined or split amongst different countries. The following table illustrates a few (simplified) examples of such changes:
|German name||English name||Native name||Now in . . .|
|Schlesien||Silesia||Poland and Czech Republic|
|Mähren||Moravia||mainly Czech Republic|
For further information please also see Wikipedia