text: Croseover the Pont Bona ? ­ parte to view the Cathedrale Saint-Jean and its astronomical clock and then stroll around the fine Ren ? ­ ais ? ­ sance houses of Lyon 's old town between the Sa ? ? ne river and the Fourviyre hill .
  
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  The astronomical clock in the Cathedrale Saint-Jean was built in the 1850s .