The LEGO Architecture Sagrada Familia (21065) is the largest LEGO building set ever produced, containing 12,060 pieces that recreate Antoni Gaudi's legendary unfinished basilica in Barcelona. The build follows a sequence inspired by the cathedral's actual construction history, starting with the Apse and Crypt, progressing through the Nativity and Passion facades, and finishing with the towers, sacristies, and Glory facade. Notable details include a stained-glass effect on the windows, and the completed model measures over 24 inches tall, making it a striking display piece for a home or office. The set is aimed at adults aged 18 and up, particularly those with an interest in European architecture, Spanish history, or travel, and it suits both dedicated LEGO collectors and fans of the Architecture theme. Building instructions are supported through the LEGO Builder app, which offers 3D guidance and progress tracking throughout the lengthy build process.