Which preposition to use with gastein

as Occurrences 1%

The clouds which have been gathering on the summits, breeding snow and rain, have descended from the heights and enveloped Gastein as in a wet blanket.

for Occurrences 1%

During the summer holidays, he was in almost constant attendance on the King, who as usual had gone to Gastein for a cure.

with Occurrences 1%

This step was the more remarkable because Napoleon had received the news of the Treaty of Gastein with marked displeasure, and had given public expression to his opinions.

Which preposition to use with  gastein