Sentence:  The ground floor entrance, a gothic doorway, is in the east wall and gives access to a small vestibule with a <WSD>murder hole</WSD>. The stairs on the left leads up to a short landing, over which is a second smaller <WSD>murder hole</WSD>. 
Meaning of the word marked with <WSD> tags:  A slit or hole above the entrance to a fortification, thought to provide access for defenders to kill invaders.