I don't remember where I came across this image but I had to look at it twice because I wasn't sure what it was at first. I'm not sure what the name of these pipes are, but they are usually used underground for heavy construction. Someone decided to design a small room in this pipe with a working door. It's so odd to have these little rooms in a place which looks like a park. There is a contrast between the pipe and surroundings (natural vs. manmade). Although these look pretty cool, I'm sure no one could actually live in them, and if a person did I think that's kind of creepy.