In architecture, a cupola // is a relatively small, most often dome-like, tall structure on top of a building.  Often used to provide a lookout or to admit light and air, it usually crowns a larger roof or dome.  
The cupola is a development during the Renaissance of the oculus, an ancient device found in Roman architecture, but being weatherproof was superior for the wetter climates of northern Europe.[ citation needed] The chhatri, seen in Indian architecture, fits the definition of a cupola when it is used atop a larger structure.[ citation needed]
Cupolas often appear as small buildings in their own right. They often serve as a belfry, belvedere, or roof lantern above a main roof. In other cases they may crown a spire, tower, or turret.  Barns often have cupolas for ventilation.  
Cupolas on the towers of Montefiascone Cathedral, Italy.
Ribbed cupola crowns the minaret of the Mosque of Uqba, in Kairouan, Tunisia.
Inside of Armenian Orthodox church cupola in Lviv, Ukraine.
Cupolas were also used on some old barns for ventilation.
A cupola-style caboose with an "angel seat" above
View from the interior of Cupola module on the International Space Station.
Optical illusion of a cupola in a church in Northern Italy ( Brivio)
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- In Italian cupola simply means dome, and the ornamental top element is called lanterna.
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