Hades. Naraka. Guinee. Xibalba. Though names may differ from one set of teachings to another, almost every religion on the planet features the concept of an underworld -- a place to which the souls of the dead are banished, for penance or punishment.
I can honestly think of dozens of reasons I fell in love with Phong Nha, Vietnam, but I think it's best to narrow it down to a few. I think people should check out this place as soon as they can. Like, tomorrow. Here's why.
Nature's light shows are the best.
The tiny town of Williston (less than 3,000 inhabitants) is famous for its peanuts and the festival that goes with it, but also for an incredible subterranean network of water flow and rivers.