This is the 5257th most frequent German word.
ausstellungssaal
Exhibition hall.
Here, 'Ausstellungssaal' is used as a subject noun describing the place that is open.
Der Ausstellungssaal ist heute geöffnet.
The exhibition hall is open today.
In this sentence, 'Ausstellungssaal' acts as a locative noun describing where the paintings were viewed.
Ich habe die Gemälde im Ausstellungssaal angesehen.
I saw the paintings in the exhibition hall.
This usage of 'Ausstellungssaal' discusses its characteristic, specifically its size, impacting the visitors.