Capital of China under 13 dynasties (more than any other city), known as Chang'an ("Perpetual Peace") for most of that history and the eastern terminus of the Silk Road — where the Terracotta Army (8,000 individually faced warrior figures placed in three pits in 210 BCE, discovered by a farmer digging a well in 1974) guards the unexcavated mausoleum of Qin Shi Huang (the First Emperor who unified China in 221 BCE), and where the 13.7 km Ming dynasty City Wall (1370-1378 CE) encircles the Muslim Quarter whose Great Mosque has been built in the Chinese architectural style since 742 CE.