The Stockholm Metro, also known as Tunnelbana, is a rapid transit system serving the city of Stockholm, Sweden. It consists of three main lines and over 100 stations, making it one of the longest metro systems in the world. The metro is known for its efficiency, connecting various neighborhoods and suburbs to the city center. Opened in 1950, the Stockholm Metro features unique artwork and designs at many stations, turning them into an underground gallery. The system operates frequently, with trains running every few minutes during peak hours, providing a reliable mode of transportation for both residents and visitors.