The phrase "empty hall" refers to a room or space that has no people or objects in it. It describes a place that is devoid of any activity, noise, or presence. Full definition
UKIP leader Nigel Farage ended up speaking to a near - empty hall of American conservative activists - even though he had been billed as a «serious candidate who can run England in the near future». (bbc.com)
The treatment is so severe that it plays like satire of bad science fiction: Nurses with military escorts scurry through empty halls, as anguished cries sound from behind closed doors. (villagevoice.com)
From empty prison cells to mysterious nuclear laboratories, the US is full of fascinating, slightly unnerving places whose empty halls echo with the stories of past occupants. (businessinsider.com)