Cambodia has had a pretty bad run of luck for the last half-millennium or so. Ever since the fall of Angkor in 1431, the once mighty Khmer Empire has been plundered by all its neighbours. Today one of Asia’s poorest countries. Be discreet with your possessions, especially cash and cameras, and take extra care in all poorly lit or more remote areas.
World Heritage Sites >> *Angkor Archaeological Park (map), *Preah Vihear Temple (map), *Sambor Prei Kuk (map). Angkor, the main reason most visitors come to Cambodia.
+ More info > Wikipedia • Wikivoyage • UNESCO
*Siem Reap (map) — access point for Angkor Wat and various other attractions in the north. *Kampong Cham (map) — nice countryside village on the Mekong river and good place to meet real Cambodia.
Cambodia has international airports at Phnom Penh and Siem Reap >> corp.cambodia-airports.aero.
Most Thai buses run to but not across each of the crossings. Exceptions include the direct bus services from Bangkok to Siem Reap and Phnom Penh, run by the Thai government bus company.
BUS: Avoid VR Express and Phnom Penh Sorya Transport Co. They have a history of threatening customers, manipulating, lying, and being unhelpful and rude. They prioritize cheating passengers of their money.