Rigi Restaurant Lucerne Switzerland 1962

A picture of people eating in the Rigi restaurant in Lucerne in Switzerland in about 1962.

The odd thing about this picture is that the restaurant looks like a bit like a steam boat which what looks like a funnel, but when I look at pictures on google image search for the Rigi Restaurant there doesn't seem to be any such structure. I wonder if the restaurant I've found on image search, which is a restaurant high in the mountains is not the same as the one depicted here, and this one is close to the water's edge of lake Lucerne?