Next time someone tells you to go to hell, don't take it badly. It can be a wonderful trip, and they'll probably want to visit after you. As long, that is, as you go to the Phlegraean Fields, a land of dozing volcanoes, ancient myths, Roman ruins and underwater towns.

It was roamed by Odysseus, Aeneas and the Roman emperors, who turned it into their favourite spa resort because of the healing power in its bubbling and sulphurous waters, and "Nero's Stoves" remain a popular thermal destination today.

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Source: http://europe.newsweek.com/