First off i have to say that cambodia is home to some of the most impressive sights i've ever laid my eyes on: the temples at Angkor. There are absolutely loads of temples here that are about 1000 years old and are on an unbelievable scale. some are pretty much intact, like the huge intact, like the vast angkor wat, and others are covered in jungle like Beng Mealea, but almost all are impressive. The number of temples is dizzying, especially zipping past them all on the back of a motorbike taxi. I spent five days at Angkor, and i was out most of the day every day in order to explore all of the main temples of interest properly. Its hard to describe the scale of the vast complexes of temples, but undoubtedly Angkor has been the highlight of Asia so far for me. Phnom Penh is a kool city and the riverfront areas are quite nice, but all SE Asian cities are kind of blurring into one for me now really haha, although u can notice definite differences between them