One of the most bizarre stories to emerge from the cult radio show Coast to Coast AM – and that’s really saying something – isn’t about UFOs or bigfoot, but a mysterious hole in the ground with some very unusual properties. Top that, History Channel!

Selects: Mangroves: Nature's Best Tree?
44:31

How the Kowloon Walled City Worked
41:27

Short Stuff: In-Flight Entertainment
12:23