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thumb|right|220px|The 10 m observation deck of [[Ronda, Spain, overlooks the Depression of Ronda plain over 100 m below.]]

An observation deck is an elevated sightseeing platform usually situated upon a tall architectural structure such as an observation tower. Fitted with railings or fencing for safety, observation decks are sometimes enclosed from weather, as many skyscraper decks, and may include coin operated telescopes for viewing distant features.

List of public observation decks

The List of public observation decks identifies observation towers with levels greater than 20 metres (66 ft) above the natural feature (e.g., mountain) on which the tower is constructed. The sortable list also includes skyscrapers, dams, and bridges with observation levels above the surface below and which allow public use for sightseeing. Until successively surpassed, the tallest observation decks were the 1793 Puente Nuevo bridge, the 1889 Eiffel Tower, the 1929 Royal Gorge Bridge, the 1931 Empire State Building, the 1972 World Trade Center south tower (420 m deck),, the 1976 CN Tower and the 2008 Shanghai WFC.