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 the Europe. 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. With a valid ticket you have access to all public transports in Berlin.