The Madrid Metro is a rapid transit system serving the city of Madrid, Spain. It is one of the largest and most efficient metro networks in the world, with over 300 kilometers of track and more than 300 stations. The system is known for its cleanliness, safety, and punctuality, making it a popular choice for both locals and tourists. Opened in 1919, the Madrid Metro has expanded significantly over the years, incorporating modern technology and accessibility features. It operates daily, providing frequent service across multiple lines that connect various neighborhoods and key landmarks, including Puerta del Sol and Parque del Retiro.