Lantern tower

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Lantern tower on Tarazona's Cathedral, Aragón, (Spain).

In architecture, the lantern tower is a tall construction above the junction of the four arms of a cruciform (cross-shaped) church, with openings through which light from outside can shine down to the crossing. Many lantern towers are usually octagonal, and gives an extra dimension to the decorated interior of the dome.

An affiliated term is the Italian tiburio, derived from the latin-derived word of tiburium which reflects the often polygonal lantern atop a dome. It is often interspersed with windows both to lighten the load and allow for light to shine.

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