Welcome to a capital city whose story goes back at least 3,000 years. In Beijing, you'll find a wealth of history, both ancient (the Hall of Preserving Harmony, Summer Palace, Forbidden City) and more recent (Chairman Mao Memorial Hall, Tiananmen Square). For the best market experience, choose the Dirt Market over the touristy Silk Market. A visit to the Great Wall, the longest manmade structure in the world, is absolutely essential.