'World's largest grave' was once up for rent
Homestay startup Airbnb in 2015 rented out what is believed to be the world's largest grave, which has remains of over six million people. It was part of a competition which offered two people a night in Paris' catacombs with a 'real bed', dinner and private concert. Airbnb reportedly paid up to â¹2 crore to rent the tunnels.