"Someone once described the experience of entering New Orleans as "being humped by a wet dog". Ask an outsider about the "Crescent City" and they'll probably reel off a brochure at you: jazz, blues, Voodoo, Mardi Gras, Creole food, graveyards and Bourbon Street. Now ask a local and they'll tell you about the heat. They'll probably swear too." Oliver Hennessey probes behind the heat to find the sultry attractions of New Orleans...