Visitors line up outside the entrance of Tsinghua University in Beijing on Saturday as they wait to enter the campus. Saturday was the first day the prestigious university was open to visitors under its summer visitation program. Photo: VCG

Groups of visitors check out the Tsinghua campus on Saturday. The visitation program, which started Saturday, runs through Aug. 11. Slots are booked solid through next Wednesday. Photo: VCG

Visitors mill around the university’s Old Gate on Saturday. The structure was built in 1909 as the entrance to the university’s predecessor, called Tsinghua Xuetang. Photo: VCG

Students visit the campus Saturday. Under the visitation program, Tsinghua has of 6,000 time slots available per day on weekends and holidays and 2,000 for normal weekdays. Photo: VCG

A woman takes a selfie with her child on Saturday in front of a building that was part of the old Tsinghua Xuetang. Photo: VCG

A family pauses next to the lawn in front of Tsinghua University’s auditorium. Located at the center of the campus, the auditorium is now mainly used for student activities. Photo: VCG

A security guard in front of the Old Gate holds a sign reminding visitors to line up in an orderly manner. Photo: VCG

Visitors purchase souvenirs from their trip to Tsinghua on Saturday. Photo: Chen Fangting/China News Service, VCG

A student tour group prepares to take a photo together in front of Tsinghua University’s auditorium on Saturday. Photo: Chen Fangting/China News Service, VCG