Phnom Penh is the capital and largest city of Cambodia, located at the confluence of the Mekong and the Tonle Sap rivers. Despite its reputation as a 'rough' city, Phnom Penh is easy to get around and is a great introduction to Cambodia.

Tuol Sleng Genocide Museum (S-21) was a school converted into Cambodia's largest prison in 1975. More than 14,000 people were tortured here before being killed at the Killing Fields south of Phnom Penh; only 8 prisoners made it out alive.