Start your day by exploring the Gothic Quarter, the oldest part of the city, filled with narrow winding streets and charming plazas. Walk through the medieval streets and visit the beautiful Barcelona Cathedral. Then, head over to the Picasso Museum to see some of the artist's best works, including some lesser-known pieces that portray his relationship with the city.
Spend your second day strolling through the whimsical Park Güell, one of the most recognizable landmarks in Barcelona, featuring colorful mosaics and stunning views of the city. After that, visit the famous Pedrera House, a modernist house designed by Antoni Gaudí, and experience its unique terrace with chimneys looking like sentries.
No trip to Barcelona is complete without a visit to the iconic Sagrada Familia, one of Barcelona's most visited attractions. Marvel at the stunning stained-glass windows and unique design of this unfinished Gaudi masterpiece. After that, head over to La Boqueria Market, the oldest market in the city, and sample some of the best food and drinks Barcelona has to offer.
If you have more time, consider taking a day trip to Montserrat Monastery or the Costa Brava beaches. Alternatively, if you have less time, skip either the Picasso Museum or the Pedrera House. Note that some attractions like the Sagrada Familia and Park Güell require advanced booking due to high demand.