The Uffizi Gallery (Italian: Galleria degli Uffizi, Italian pronunciation: [ˌɡalleˈria deʎʎi ufˈfittsi]) is a museum in Florence, Italy. It is one of the oldest and most famous art museums of the Western world.

Building of the palace was begun by Giorgio Vasari in 1560 for Cosimo I de' Medici as the offices for the Florentine magistrates — hence the name "uffizi" ("offices"). Construction was continued to Vasari's design by Alfonso Parigi and Bernardo Buontalenti and ended in 1581. The cortile (internal courtyard) is so long and narrow, and open to the Arno River at its far end through a Doric screen that articulates the space without blocking it, that architectural historians treat it as the first regularized streetscape of Europe. Vasari, a painter as well as architect, emphasized the perspective length by the matching facades' continuous roof cornices, and unbroken cornices between storeys and the three continuous steps on which the palace-fronts stand. The niches in the piers that alternate with columns filled with sculptures of famous artists in the 19th century.
The Palazzo degli Uffizi brought together under one roof the administrative offices, the Tribunal and the state archive (Archivio di Stato). The project that was planned by Cosimo I de' Medici, Grand Duke of Tuscany to arrange that prime works of art in the Medici collections on the piano nobile was effected by Francis I of Tuscany, who commissioned from Buontalenti the famous Tribuna degli Uffizi that united a selection of the outstanding masterpieces in the collection in an ensemble that was a star attraction of the Grand Tour.
Over the years, further parts of the palace evolved into a display place for many of the paintings and sculpture collected by the Medici family or commissioned by them. According to Vasari, who was not only the architect of the Uffizi but also the author of Lives of the Artists, published in 1550 and 1568, artists such as Leonardo da Vinci and Michelangelo gathered at the Uffizi "for beauty, for work and for recreation."
After the house of Medici was extinguished, the art treasures remained in Florence by terms of the famous Patto di famiglia negotiated by Anna Maria Luisa, the last Medici heiress; it formed one of the first modern museums. The gallery had been open to visitors by request since the sixteenth century, and in 1765 it was officially opened to the public.
https://en.wikipedia.org/wiki/Uffizi