Chinese emperors built the Great Wall to keep out rampaging hordes of Mongolian soldiers mounted on horseback streaming down from the north, but no amount of stone and mortar can repel hordes of tourists riding luxury motor coaches. These groups, armed with digital cameras, arrive by the thousands each day. You can avoid them, though, by veering slightly off the beaten path to tour a part of the wall that is less visited. Hiring your own driver will also vastly improve your Great Wall experience.
According to urban legend, the Great Wall is visible from outer space. Like many tales that get passed around from modem to modem, it is wrong. The structure, which follows the undulating contours of the hills and is in some areas no more than an earth-colored pile of dirt and rubble, is barely visible from an airplane flying at 40,000 feet, let alone by an astronaut in low earth orbit.