Angkor Wat is the best known of the many Khmer temples. There are hundreds in various stages of disrepair, restoration or outright pillaged.
The general structure of a temple (with many exceptions) is a central building in tiers (much like a low, broad wedding cake) designed to simulate the sacred mountain. Around the temple was often a wall with spectacular gates and then the ancient Khmers would often dig a large moat around the whole complex so it would be sitting on an island in the middle of an artificial lake. Bridges were appropriately decorative.
The religion was a mix of Hinduism and Buddhism with a leavening of indigenous Animism. Prominence of Hindu versus Buddhist symbols and figures depended on the predilection of the King at that time, with previous symbols being defaced or modified. There are some wonderful examples of how the Hindu kings designed a simple, few chisel strokes method for transforming stone images of the Buddha into the Hindu hermit image!
The temples are amazing. The stairs are incredibly steep so you have to literally crawl up (going down is often terrifying - modern wooden stairs are often overlaid for safety) and door lintels are low so you have to bow. The stonework is lovely, especially in the soft light of dawn or dusk. The most haunting pictures are where the jungle is inexorably reclaiming the temples.
Angkor Wat is the largest of the temple complexes. Estimates are that it was the centre of a population of over a million in 1,000 AD, making it the largest city in the world at that time. The many wooden palaces and homes have long been reclaimed by the jungle.
Angkor Wat rises out of the jungle like a vision from a Kipling novel. It is inherently mysterious and haunting....we tried to visit at night but not on the agenda.
Closing in you can see the galleries/cloisters that ring the structure - more later about the wall carvings
Angkor is a repetition of images - one being the multi-headed snake (3, 5 and 7 head versions) - this one, with 7 heads, is very eroded

The other repeated figures are the "Apsaras" - the temple dancers. They occur in numerous lovely variants and still appear in modern Indochinese imagery:
Throughout, the temples are intricately carved, but sadly many carvings have been pillaged and are now gracing the penthouse of a wealthy collector:
It is the wall carvings in the cloisters that are most impressive. Hundreds of feet long, they depict tales from religious legend and the victories of living kings. The shallow carvings are things of light, changing with the movement of the sun. They are ephemerally beautiful.
We had an excellent guide - Dara - who greatly enriched our experience.
Something as simple as a window becomes a design achievement for the Khmers

We mentioned the steep stairs...some photos to prove the point. You crawl up....edge carefully down....unless they are overlain with new flights
You can take a balloon flight to see Angkor from the air. We took a pass....perhaps a mistake

Angkor Wat is lovely and a must for any life list. We close with the Guardian Lion, who - though battered - still mans his post