In architecture, a cupola is a relatively small, usually dome-like structure on top of a building often crowning a larger roof or dome. Cupolas often serve as a roof lantern to admit light and air or
Cupolas on the towers of Montefiascone Cathedral, Italy
White marble cupolas cap minarets at the Tomb of Jahangir in Lahore, Pakistan
The dome of Florence Cathedral with a roof lantern at the top
Interior of cupola ceiling in the old Synagogue of Győr, Hungary.
A belvedere or belvidere is an architectural structure sited to take advantage of a fine or scenic view. The term has been used both for rooms in the upper part of a building or structures on the roof
Cupola
…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. Barns often have cupolas for ventilation. Cupolas can also…
Belvederes crown the two towers at the outer corners of Blenheim Palace, United Kingdom
Pashkov House in Moscow, Russia, crowned with a belvedere
A carousel in the Cortile del Belvedere, 1565
Belvedere in the park of the Glienicke Palace, in Berlin