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In Architecture , a cupola consists of a Dome -shaped ornamental structure located on top of a larger Roof or dome, often used as a lookout or to admit light and provide ventilation. The word comes from the Italian , and expresses the idea of a "small tub".

In some cases, the entire main roof of a tower or spire can form a single cupola. More frequently, however, the cupola comprises a smaller structure which sits on top of the main roof. If the cupola can be reached by climbing a Stairway inside the building, it is referred to as a '' Belvedere '' or ''widow's walk''. Some cupolas, called ''lanterns'', have small windows which illuminate the areas below.


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