Cupola

The cupola evolved during the Renaissance from the older oculus. Being weatherproof, the cupola was better suited to the wetter climates of northern Europe. The chhatri, seen in Indian architecture, fits the definition of a cupola when it is used atop a larger structure.

Cupolas often serve as a belfry, belvedere, or roof lantern above a main roof. In other cases they may crown a spire, tower, or turret.[4] Barns often have cupolas for ventilation.[5][6]

Cupolas can also appear as small buildings in their own right.

The square, dome-like segment of a North American railroad train caboose that contains the second-level or "angel" seats is also called a cupola.[7][8]

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  White marble cupolas cap minarets at the Tomb of Jahangir in Lahore, Pakistan
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  Cupolas on the towers of Montefiascone Cathedral, Italy.
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  Interior of cupola ceiling in the old Synagogue of Győr, Hungary.
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  Ribbed cupola crowns the minaret of the Mosque of Uqba, in Kairouan, Tunisia.
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  Inside of Armenian Orthodox church cupola in Lviv, Ukraine.
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  Cupolas were also used on some old barns for ventilation.
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  View from the interior of the Cupola module on the International Space Station.
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  Trompe-l'œil painting of a cupola in a church in Northern Italy (Brivio)
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  A cupola-style caboose with an "angel seat" above

The turret of a Japanese Type 91 Ha-Go light tank with its distinctive, bubble-shaped commander's cupola

The term cupola can also refer to the protrusions atop an armoured fighting vehicle due to their distinctive dome-like appearance. They allow crew or personnel to observe, offering very good all round vision,[9] or even field weaponry, without being exposed to incoming fire. Later designs, however, became progressively flatter and less prominent as technology evolved to allow designers to reduce the profile of their vehicles.

• Cupola (ISS module)
• Daylighting
• Windcatcher