This Halloween, two people will have the chance to experience a night to remember 20m below Paris in the city's catacombs.

Spend the night surrounded by human remains

Spend the night surrounded by human remains

"Bienvenue to the bowels of Paris!" says the offer on the home rental website, Airbnb, advertising a competition that will allow winners to spend the night in the world's largest grave, "the final resting place of 6 million souls."

One of Paris's most popular attractions, the expansive network of underground tunnels, filled with human skulls and bones, receive around 500,000 visitors a year. Toward the end of the 18th century, the city began transferring human remains from Parisian cemeteries to the tunnels in the interests of public health.

Airbnb's competition allows two adventurous people to spend the night in the catacombs, learning about "the hair-raising history of this mysterious subterranean labyrinth."

The winners will enjoy a "dazzling culinary experience" along with a private concert, before going to sleep in a "real bed".

"Before bedtime, a storyteller will have you spellbound with fascinating tales from the catacombs, guaranteed to produce nightmares. Finally, enjoy dawn with the dead, as you become the only living person ever to wake up in the Paris catacombs," says the website.

For a chance to win, daring hopefuls must submit an entry on the website before October 20th, telling the host "why you think you're brave enough to sleep in the catacombs."

According the The Guardian, California-based Airbnb paid up to 350,000 euros to privatise the tunnels, and the Paris town hall hoped this would "boost capital by finding new sources of revenue [and allow for] the preservation of this heritage site".