From The Collaborative International Dictionary of English v.0.48:
Niche \Niche\ (n[i^]ch), n. [F., fr. It. nicchia, prop., a
shell-like recess in a wall, fr. nicchio a shellfish, mussel,
fr. L. mytilus.]
A cavity, hollow, or recess, generally within the thickness
of a wall, for a statue, bust, or other erect ornament.
Hence, any similar position, literal or figurative.
[1913 Webster]
Images defended from the injuries of the weather by
niches of stone wherein they are placed. --Evelun.
[1913 Webster]