So I’ve given you tips on how to explore the catacombs, party in the catacombs, farm organic mushrooms in the catacombs and even swim in the catacombs, but would you dare to sleep in the Parisian catacombs? Picture a fluffy white duvet, expertly plumped pillows, surrounded by candlelight … and six million human skeletons. Yup, it’s the latest…