The Berlin U-Bahn is a rapid transit system in Berlin, Germany. It was opened in 1902, making it one of the oldest metro systems in Europe. The system consists of 10 lines and 173 stations.
U-Bahn runs from 04:00 to 01:00 on weekdays and around the clock on weekends. Interval on weekdays is about 5 minutes, and during weekends 10-15 minutes. You can access all of Berlin's public transport with a valid ticket.