Most of the remains are displayed at the Zhoukoudian Peking Man Museum. The caves were surrouding the museum including a small earthquake museum.
Take the bus in Beijing Town Centre, Tianqiao bus No. 917, be careful there are a lot of bus No. 917 make sure you take the one which is via. Zhoukoudian Village.
Where you arrive in Zhoukoudian (around 1 1/4 hours), then take a local minibus no. 2 (RMB 0.5) heading to the direction of foot of the hill, once you pass the small bridge, alight and walk across the railway track and you will see the entrance.