A research institute has released a 3-D geological map showing the underground structure of Tokyo's 23 wards designed to help residents think about weak areas and better prepare for earthquakes ...

Underneath Tokyo’s bustling metropolis lies a maze of concrete tunnels built by Nippon Telegraph and Telephone Corporation to hold telephone and Internet cables. Photo: Alexander Martin/The Wall ...

Complex map - Tokyo Metro's nine lines -- named Ginza ... The spotless and punctual air-conditioned trains form only one part of a vast underground and overground rail system serving Greater ...