Barcelona was the favorite stop on our two-week visit to the Mediterranean when my two granddaughters and I sailed aboard the Crystal Serenity. I opted for extra time, knowing they would love it, too. The charming city recalls Paris with broad, tree-lined boulevards dotted with monuments and fountains. Its wonders attract lovers of antiquities and modern art, as well. One of my granddaughters, Cydnie Staub, 17, was entranced by the city’s beauty and kept snapping away with her camera.