NEW YORK, Sept 11 ­— Kit Eaton reviews three apps that will help you better navigate Paris, from its transit system to the Louvre.—New York Times

Mexican tourists, Claudia and Oswaldo, pose on the Pont de l’Archeveche bridge, which is covered with thousands of padlocks, called love locks, near the Notre Dame Cathedral in Paris August 13, 2014. — Reuters pic
Mexican tourists, Claudia and Oswaldo, pose on the Pont de l’Archeveche bridge, which is covered with thousands of padlocks, called love locks, near the Notre Dame Cathedral in Paris August 13, 2014. — Reuters pic