Barcelona, the capital of the Catalonia region, is probably the most popular destination in Spain, priding itself with mindblowing architecture, artsy scene, and museums of world-famous artists. The city is like an open-air museum, where you need to be careful while strolling down its streets in order not to miss something very unique and beautiful. Therefore, here’s the ultimate guide of what to do in Barcelona on a budget. Getting around Barcelona Before I talk about navigating yourself through Barcelona, you’ll need to know how to get from Barcelona airport to the city center. There’s a direct bus called Aerobus that stands at every arrival hall of the airport and…