Line 5 of the Beijing Subway is Beijing's only subway line with an entirely north-south route. Line 5's color is maroon. It entered into operation on October 7, 2007. It runs for 27.6 km (17.1 mi) in a near straight line through the city center from Tiantongyuanbei in Changping District to Songjiazhuang in Fengtai District. Though Line 4 and Line 8 also broadly follow north-south routes, Line 5 remains the only line to follow an almost entirely straight north-south course. Line 5 is also notable for including three stations in the densely populated northern suburb of Tiantongyuan, as well as providing convenient access to the Temple of Earth and Temple of Heaven. Since Line 5 connects with Line 1, Line 2 (twice), Line 6, Line 7, Line 10 (twice), Line 13, Line 14 and Line 15, and also links densely populated suburbs directly to the city center, it tends to experience very crowded conditions during rush hour and even very late into the evening. Over 1 million passengers use the line every weekday in 2019.

The Temple of Heaven is a complex of imperial religious buildings situated in the southeastern part of central Beijing. The complex was visited by the Emperors of the Ming and Qing dynasties for annual ceremonies of prayer to Heaven for a good harvest. The Temple of Heaven was inscribed as a World Heritage site in 1998 and was described as "a masterpiece of architecture and landscape design which simply and graphically illustrates a cosmogony of great importance for the evolution of one of the world's great civilizations..." as the "symbolic layout and design of the Temple of Heaven had a profound influence on architecture and planning in the Far East over many centuries."