Barcelona has so many gorgeous Modernist buildings, Gothic alleys, and Mediterranean beaches surrounded by majestic green hills that you could spend your whole vacation just roaming about admiring the scenery - but you won't want to miss out on the cultural activities inside those lovely surroundings.
Barcelona's transportation is superb, with an easy-to-use metro system, an extensive network of frequent and quick buses, a tram service, commuter trains, and taxis making it easy to make the most of your stay. It is accessible 24/7/365 and includes night buses and extended service hours on weekends (including nonstop metro service on Saturdays and special holidays).