There are areas of Asia that are just magnificent. Ayutthaya is one of them. Formally the capital city of Siam it reached a population of almost one million people only 300 years ago, before declining to as low as the 55 thousand citizens of today. It is one of the ancient city in the world and you can walk through the lanes like in a museum. This historical park is not to be missed if in Thailand, just 2 hours drive from Bangkok.
View the formal Khmer Thailand-Cambodia highway series for more incredible places to visit