0 a place on a building or boat from where you can see or watch something: --
We're on an observation platform that overlooks the heart of the Everglades.
The city's tallest skyscraper reopened its observation deck yesterday.
During the tour deep inside the vessel, they paused by the glass-encased observation deck overlooking the engine room.
Employees erected wood duck boxes and a pedestrian path with observation decks and bridges.
The luxury residence is going to be capped by an observation deck visible 50 miles away.