The feeling of flying high above Angkor Wat and other temples is one that I will never forget as long as I live. I can imagine that so much of the landscape has not changed in 1,000 years.
If you come to Siem Riep, please, please do this. I did a 15-minute one with a wonderful pilot with a great name (Annie!), from Helicopters Cambodia.
It's an exhilarating high.