Catalonia is home to numerous historical sites that reflect its rich cultural heritage. One of the most famous is the Sagrada Família, an iconic basilica designed by architect Antoni Gaudí. This UNESCO World Heritage site showcases unique architectural styles and attracts millions of visitors each year. Another significant site is the Roman ruins of Tarragona, which include a well-preserved amphitheater and ancient walls. These remnants highlight the region's importance during the Roman Empire. Additionally, the Gothic Quarter in Barcelona features medieval buildings and narrow streets, offering a glimpse into the city's past.