Palazzo Pitti was built for Renaissance banker Luca Pitti. A loyal consigliere to Cosimo de Medici, Pitti wanted a mansion built to rival those of the mighty Medici. He did pretty well: about 100 years after its construction the Medici acquired it and moved in. With a grand courtyard, Royal Apartments, the Palatine Gallery and a high Baroque interior design, this is a worthy Renaissance palace.
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P.S. on the time/day that I visited, there was hardly a line, but for me personally, it’s still nice to have “skip the line” tickets before hand for peace of mind!