Barcelona Cathedral is open to visitors from 9:30 a.m. to 6:30 p.m. on weekdays, 9:30 a.m. to 5:15 p.m. on Saturdays and 2 ...

Less obvious cities are on this list of cultural hotspots, alongside unmissable artistic centers like London and Paris.

Step into a storybook town where whitewashed walls are punctuated by flower-filled patios and a mosque dating back more than ...