Moscow Metro
Opened in 1935, it is the world's busiest and the 6th longest subway. Its “palaces for the people” gold, marble, and mosaics stations are one of the most beautiful in the world Map:
Opened in 1935, it is the world's busiest and the 6th longest subway. Its “palaces for the people” gold, marble, and mosaics stations are one of the most beautiful in the world Map: