| 1927 | Anna and Michael Holzer bought the lakeside property and build a lido with buffet on it |
| 1929/30 | construction of a beach guest house with 21 rooms
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| 1950 | take over of the guest house by daughter Rudolfine after the death of her father Michael Holzer |
| 1957 | marriage with Ferdinand Sammer |
| 1960 | extension to a hotel with 35 rooms - the first room with private bath and toilet was built
|
| 1968 | renovation of all rooms with shower or bath/toilet |
| 1971/72 | construction of the hotel Kristall in Bad Kleinkirchheim, Austria
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| 1979 | the first sauna and tennisplatz were built
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| 1985 | extension to 55 rooms
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| 1987 | the indoor swimming pool was built |
| 1989 | beach pool and beach bar "Seeklub" were built and the public lido was made private for hotel guests only
|
| 1990 | take over of the hotel by her son Michael |
| 1991 | marriage with Marianne, birth of son Maximilian |
| 1992 | birth of son Michael-Hubertus |
| 1994 | birth of daughter Magdalena |
| 1994 | 24 new junior suites and suites were built, new hotel hall and lobby |
| 2003 | construction of the new lake sauna island - nomination for the Austrian tourism award
|
| 2007 | purchase of the hotel Birkenhof at the lake Klopeiner See |
| 2012 | project: Sporthotel in Bad Kleinkirchheim , north Carinthia |
