In January we were blessed to have friends visit us in Thailand where we live, and after traveling a bit in Thailand we went with them to Siem Reap, Cambodia. A highlight was Angkor, incredible remains of the Khmer empire from the 9th to the 15th centuries. It is one of the most amazing historic places to see in Southeast Asia.
Here is a link for more information if you are interested. https://whc.unesco.org/en/list/668