I think it's time for Ananka's Diary to return to it's roots. Secret stuff. I found this amazing post over at Mentalfloss today. I thought I knew everything there was to know about America's secret subways. But guess what! I didn't! That ought to teach me.
Some of the secret subways have already been covered in this blog. However, there's enough new information there to keep you reading!
(Notice that the post only mentions American secret subways. If you really want your mind blown, look up some of the conspiracy theories surrounding the Tokyo subway system.)
BONUS SECRET STUFF HERE.