View from one of the big temples, Phimeanakas, in the Angkor Thom complex, Siem Reap, Cambodja.
Buddhist statue in the gardens of the Royal Palace in Phnom Penh.
Be sure to get there on time, there is only space for about 300 people and it is strictly regulated. There were times that more than 1000 people climbed the temple to enjoy the sunset, however, the construction and the current state of this heritage site is not calculated for that many people. Be aware that (unfortunately) tripods are not allowed!
Phnom Penh is a go-to to learn about Cambodia's history mainly for the Killing Fields of Choeng Ek. In the photo is the beautiful roof of the Choeng Ek memorial accompanied by a large palm tree
You don't need to know the language to follow the story. Also by going there, you support the shows' non-profit organization which helps poor children and young adults get an education and a chance to become a performer themselves.
The second time I went to see the sunrise at the Angkor Wat Temple I didn't have to get tickets first and could, therefore, obtain a much better spot to photograph from. Make sure you get there early enough, preferably around 5 am because it won't stop hundreds of others to get there as well. Pro tip: if you are planning to get a 1-day pass or planning to visit Angkor Wat multiple times during sunrise, buy the ticket a day in advance. Ticket booths open at 5 am while its at least a 15 minutes drive from the Angkor Wat Temple.