Metros around the world, photos and music.

2. Amsterdam, The Netherlands.

3. Athens, Greece.

4. Bangkok, Thailand.

5. Barcelona, Spain.

6. Beijing, China

7. Berlin, Germany.

8. Bilbao, Spain.

9. Brussels, Belgium.

10. Bucharest, Romania

11. Budapest, Hungary

12. Buenos Aires, Argentina

13. Busan, South Korea

14. Chicago, USA

15. Ciudad de Mexico, Mexico

16. Copenhagen, Denmark

17. Delhi, India

18. Dortmund, Germany

19. Essen, Germany

20. Frankfurt, Germany

21. Glasgow, Scotland

22. Guangzhou, China

23. Hamburg, Germany

24. Hannover, Germany

25. Helsinki, Finland

26. Hong Kong, China

27. Istanbul, Turkey.

28. Kharkov, Ukraine

29. Kiev, Ukraine

30. Lisbon, Portugal

31. London, England.

32. Lyon, France

33. Madrid, Spain

34. Marseille, France

35. Milan, Italy

36. Minsk, Belarus.

37. Monaco

38. Montreal, Canada

39. Moscow, Russia

40. Munich, Germany

41. Nanjing, China

42. Naples, Italy

43. New York, USA

44. Nurnberg, Germany

45. Paris, France

46. Prague, Czech Republic

47. Puhŭng, North Korea

48. Rio de Janeiro, Brazil

49. Rome, Italy

50. Rotterdam, The Netherlands

51. San Francisco, USA

52. Santiago, Chile

53. Sao Paulo, Brazil

54. Sapporo, Japan.

55. Seoul, South Korea.

56. Shanghai, China

57. Sofia, Bulgaria

58. St Petersburg, Russia

59. Stockholm, Sweden

60. Stuttgart, Germany

61. Taipei, Taiwan

62. Tashkent, Uzbekistan

63. Tehran, Iran

64. Tokyo, Japan

65. Toronto, Canada

66. Vancouver, Canada

67. Vienna, Austria

68. Warsaw, Poland

69. Washington, USA