The Berlin U-Bahn is a rapid transit system serving the city of Berlin, Germany. It consists of 11 lines and over 170 stations, making it one of the largest and most efficient subway systems in the world. The U-Bahn operates daily, providing a reliable means of transportation for both residents and visitors. Opened in 1902, the U-Bahn has undergone significant expansion and modernization. It connects various neighborhoods and key attractions, including Brandenburg Gate and Alexanderplatz. The system is known for its punctuality and cleanliness, making it a popular choice for commuting and sightseeing in Berlin.