(CNN) Every hour, dozens of trains zip in and out of "Gara de Nord" in Bucharest, Romania.
Like all train stations, it is generally transient, taking passengers from point A to B. People stay only as long as their wait for boarding call.
But there are some who have set up shop here -- not to make a living -- but to live.
An entire community resides at Gara de Nord, in an underground series of tunnels that was built as Bucharest's central heating system decades ago.
Read the rest at CNN.com: http://www.cnn.com/2015/08/25/world/cnnphotos-bucharest-romania-train-tunnels/index.html