Discover the highlights of Barcelona on a full-day tour from Madrid. Begin by exploring the Gothic Quarter, a maze of alleys and squares surrounded by historic houses, Gothic churches, and palaces that offer a glimpse into the city's medieval past. Appreciate Antoni Gaudi's architectural masterpieces, including Casa Batllo and the Sagrada Familia, and delve into their fascinating histories. As the sun sets, return to Madrid on a high-speed train.