The Gaudi half-day tour was the highlight of my trip to Barcelona! Starting with the unique exteriors of Casa Batlló and Casa Milà, the lizard fountain and trencadís benches in the fairytale-like Park Güell were truly impressive. The Sagrada Familia, the final stop, was magnificent, and the cascade of light created an unforgettable thrill. Thanks to our guide's in-depth storytelling, it was a fulfilling half-day where I truly saw more because I knew more. It was also the best choice physically, as it allowed us to make good use of the afternoon. I highly recommend it as a must-do in Barcelona!