City Caves

We have probably all heard of people who explore caves. Spelunker is the term that refers to a person who explores caves.

Well, there are people who explore man-made cave like structures inside cities. Underneath every major city exists many tunnels that are easily large enough for a person to walk through. These are not places to go during a major rainstorm, but when it is dry outside, they are not quite as dangerous.

Examples from where I live are shown at the Vanishing Point website.

Visit. It is quite intriguing.