Transit in Peking for 13-20 hours stopover - do I need a visa to make a city tour during layover?

I am flying Vienna (VIE) - Yangon (RGN) - Vienna(VIE), and will have some long layovers in Peking on both lags with 13 hours and 20 hours each on onward and return trips. If I want to go outside the airport and wish to make a city tour in Peking during those long layover, do I need to apply an entry permit? I am a Myanmar citizen, and I do not see it was listed for the free transit countries.