The golden-roofed Jokhang is 1300 years old and one of Tibet's holiest shrines. It was built to commemorate the marriage of the Tang princess Wen Cheng to King Songtsen Gampo. Located in the center of old Lhasa, the temple was built by craftsmen from Tibet, inland China, and Nepal and thus features different architectural styles. The temple is also the spiritual center of Tibet and the holiest destination for all Tibetan Buddhist pilgrims. The Barkhor is essentially a pilgrim circuit which is followed clockwise round the periphery of the Jokhang. Shaped roughly like an octagon, it is also a hive of market activity.