AbandonedPorn: The Rotting Underwater Ballroom. Photo by Dan Raven [OS] [1200x807]. (story and more in comments).

https://farm9.staticflickr.com/8488/8215974081_640145a080_o.jpg via /r/AbandonedPorn http://www.reddit.com/r/AbandonedPorn/comments/31bdub/the_rotting_underwater_ballroom_photo_by_dan/