I bet you missed Beng Mealea Temple when you visited Angkor Wat in Siem Reap but, not to worry.
Make this a compelling reason to go back to Cambodia. Just short of an hour from Siem Reap, on the same road going to Preah Vihear, this temple opened in 2005, though to the locals, they have known this temple for a thousand years.
Many locals refer to this as the jungle temple as it has been left to Nature to take over for many, many years. Maybe it was a good thing as it has been preserved from looting as well.
For more on Beng Mealea, click here.