Tokyo, Japan
No matter how prepared you are, Tokyo hits you like a ton of bricks. This city is big, it's busy, and it's also a lot of fun. How big and busy is it? Including Yokohama, a 2007 estimate puts the population at 35.7 million (the entire population of Canada is roughly 34.5 million) making it by far the world's most populous metropolitan area with a population density of 2,642 persons/km² (Canada's density is roughly 3.75 persons/km²). The area has ...