The San Francisco cable car system is a historic mode of transportation in San Francisco, California. Established in the late 19th century, it is the only manually operated cable car system still in existence. The system consists of three lines that run on steep hills, providing a unique way to navigate the city's challenging terrain. Cable cars are powered by a continuously moving cable beneath the street, which grips onto the cars to pull them along. Passengers can enjoy scenic views of the city while riding, making it a popular attraction for both locals and tourists. The cable car system is a designated National Historic Landmark.