On their first day, the Pinna family sets off on their exploration with a tour of the city on a double-decker bus that passes by many of the city's famous landmarks, including Brandenburg Gate, the Unter den Linden boulevard, and the East Side Gallery, which is the longest surviving stretch of the Berlin Wall. On the way, they pay a visit to the AquaDom, which is the world's largest cylindrical aquarium, and a museum that shows what life was like in the former East Germany. When night falls, the Pinnas take in a musical at the Theater des Westens.