Mostly relics and ruins of the Ancient Kingdom of Krung Tai (Siam). Must have been an extraordinary fairytale-like scene before the Burmese got their hands on it, ripped the jewels and gold from the structures, busted up the Buddha statues and just generally made a mess of the place.
Specific location galleries at See Siam.com.
Tune: "The Old Man and the Sea II" by Ivan Chew via Creative Commons.