The Barcelona Metro is an extensive underground train system that serves the city of Barcelona, Spain. It consists of 12 lines and over 150 stations, making it one of the largest metro networks in Europe. The metro is known for its efficiency, cleanliness, and accessibility, providing a convenient way for residents and tourists to navigate the city. The metro operates from early morning until midnight, with extended hours on weekends. Tickets can be purchased at machines in stations, and various travel passes are available for frequent users. The Barcelona Metro connects with other public transport options, including buses and trams, enhancing overall mobility in the city.