Millions of people sleep underneath the streets of Paris each night. They're all dead. No money is required for this Halloween night's stay in the Paris Catacombs, but you do need to be alive. This unique accommodation will be offered for a single night only, to the person (and their mate/spouse/death-obsessed partner) who best explains to the host why they're brave enough to sleep under the dirt. It's not for the faint-hearted, either, with the exposed skulls and bones of those long since deceased placed just inches from your bed, serving as a grisly reminder of your own mortality.