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The Santa Maria del Fiore, commonly known as the Duomo, defines Florence's skyline with its magnificent dome. While there is a fee to climb to the top, entering the cathedral and soaking in its Gothic beauty is completely free. This structure is a testament to Renaissance brilliance, making it an essential stop.
Visitors should brace themselves for a line, which often winds around the building, as many flock to admire its intricate details and the famous Last Judgment fresco on the inside dome.