a platform or open area on top of a tall building or natural feature from which the public may view the surrounding panorama
How many proposals could the observation deck of the Empire State Building have seen in its 75 years?
He could work there as well as on the observation deck, anyway.
George Hanlon glanced about the observation deck and saw at some distance the young man who had sat at the same dining table.
Dontor strode firmly toward the ladder leading to the observation deck.
They got out on the observation deck, and Scott walked directly to a small door at the end of a corridor.
He went back to the observation deck, picked up the PA-phone, and called for attention.