Can an Indian citizen get transit visa if layover is less than 72hrs at PEK airport?

Hi I have an Indian passport but traveling from Auckland to India. I have a layover at PEK Beijing airport for 16hrs 30 mins in which time I would like to visit the Great Wall of China. Will I get the permission to leave the airport during my layover time n do so n then catch my connecting flight from PEK airport to delhi India???? Please let me know as soon as possible.