Travel by public bus to the capital city of Phnom Penh (about 4 hours). Cambodia's capital is set on a major junction of the Mekong and Tonle Sap rivers and boasts some fine examples of French-inspired architecture. A recommended option is to visit the Choeung Ek Memorial, where a stupa made of some 8000 human skulls marks the site of the infamous Killing Fields, the execution ground for the torture victims of Tuol Sleng. Or learn about a brighter period of Cambodian history by visiting the Royal Palace and Silver Pagoda. Wat Phnom, shrouded in myth, is equally worth a visit, as is the National Museum with its excellent Khmer collection. Cyclo tours around the city are a great alternative to walking and generally include the central market, US Embassy, Wat Phnom, Mekong river front, independence monument and Royal Palace. Keen shoppers can hit the art-deco Psar Thmei (Central Market).