9Bosa, Sardinia
 
                                
                            This riverfront town in western Sardinia is distinguished by a jumble of hillside houses painted every color of the rainbow, with a 12th-century castle looming above.
 
                                
                            This riverfront town in western Sardinia is distinguished by a jumble of hillside houses painted every color of the rainbow, with a 12th-century castle looming above.