Episode 57 begins with a discussion of the mysterious death of Michael Hastings.  Was this notable journalist murdered because he uncovered government corruption?
The main topic of the episode is Coral Castle, a puzzling monument which stands in south Florida.  Was its lone creator, Edward Leedskalnin, a genius who uncovered the secrets of the pyramids, a time-traveler, an alien, or just a dedicated man who longed for his lost "Sweet Sixteen?"