text: Antonio da Sangallo the Elder , architect of many of the town 's palazzi , built his masterpiece , the 16th-century church of San Biagio , southwest of town , a gem of High Renaissance architecture hidden at the end of a cypress-lined road with views of the Chiana valley .
  
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  The church of San Biagio is over three hundred years old and was built by Antonio da Sangallo the Elder .