Badaling is the most visited section of the Great Wall of China, approximately (70 km) northwest of Beijing city in Yanqing County. The portion of the wall running through the site was built during the Ming Dynasty, along with a military outpost reflecting the location's strategic importance. The highest point of Badaling is Beibalou approximately 1015 m above sea level. The parts of the wall at Badaling has heavy restoration, and in 1957 it was the first section of the wall to open for tourists. Now visited by millions. The recently completed Badaling Expressway connects Badaling with Beijing. It was here that President Richard Nixon visited on February 1972, during his journey to China.