Barcelona is a vibrant city of Spain with a mix of history, culture and heritage. It has famous places, buildings and architecture that are famous historically. It has many tourist spots such as Sagrada Familia, Park Güell, La Rambla, Gothic Quarter(Barri Gotic), and many more. Barcelona has many iconic places. To visit all this in a day trip is difficult but you can use bus service for sightseeing for the complete. It provides you with a cheaper price.
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https://www.sightseeingo.com/spain/best-things-to-do-in-barcelona