An old watch tower provides a great vantage point of Xi'an. The old city wall built in the 14th century of mud, limestone, and glutinous rice has been refurbished and runs 9 miles around the city with watch towers every 400 feet. Surprisingly the wall was never put to the test as Xi'an was never attacked in ancient times. In modern times though it's used as a park. People can walk around it or rent bikes and go for a ride to get a complete view of the old city. Sherry Ott traveled to China courtesy of the China National Tourist Office (www.cnto.org) and Wendy Wu Tours (www.wendywutours.com/china/USTOATravelTogether) as part of AFAR’s partnership with The United States Tour Operators Association (USTOA) (www.ustoa.com), whose members provide travelers with unparalleled access, insider knowledge, and peace-of-mind to destinations across the globe. For more info on Sherry’s journey, visit the USTOA blog (http://ustoa.com/blog).