long gallery

noun

a large gallery, found especially in the uppermost stories of Elizabethan and Jacobean manor houses, used as a family room and as a promenade.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for long gallery

Historical Examples of long gallery

But more often his days were spent exclusively in the Long-Gallery.
The History of Sir Richard Calmady
Lucas Malet