What should I do on my first trip to Barcelona?
Sagrada Familia is Barcelona's most-visited attraction, and for very good reason — it's incredible. Go early (or late) to avoid the biggest crowds, but make sure it's on your to-do list. The masterpiece of renowned architect Antoni Gaudí, it's the most impressive building in the city, although the other Gaudí designs across the city are stiff competition. Step inside on a sunny day and the effect of the stained glass is mesmerizing.