If you have extra time in Barcelona, then Girona is 100% worth visiting. Out of all the day trip options from Barcelona, Girona is hands down my favorite. The city oozes character and medieval vibes. It's beyond picturesque.
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That is a question to which there is no easy answer! Both are well worth a visit. Tarragona has excellent Roman ruins whilst Girona has a lovely old town to wander around and city walls from which there are excellent views. You can reach both by train, Girona is quicker if you get the fast AVE train.
Girona is known for its Ciutat Antiga (Old City) and especially its 13th-century Jewish Quarter. Known as the Call, the district is considered to be one of Europe's largest and best-preserved Jewish quarters.
Walking the old city walls of Girona is a must-do on your exploration around the city. From the top of the walls, you can see gorgeous panoramic views of the city, the terracotta rooftops — and, in the distance, the Pyrenees Mountains and the surrounding countryside.