I took an overnight train from Chiang Mai to Ayuttahaya. I arrived in the late afternoon, found an inexpensive guesthouse, and then set out to explore the ruins of the ancient city. I was very impressed, because I didn't have an idea what to expect.
Ayuttahaya had been the capital of Thailand from the 1300's to the 1700's. Because it was the capital, it suffered through many invasions by enemy armies. The city had withstood 23 invasions by the Bermese before it fell during the 24th try. They then sacked the city.
The city is located on an island and is completely surrounded by a river. The modern city is located on the east part of the island, and the ancient ruins are in the middle and west part of the island. There are maybe about a dozen sites with old brick buildings standing. They are surrounded by ample open spaces - its like a huge park.
The city is a location which has been recognized by the UNESCO as a World Heritage Site.
The site below features nightime lighting which looks very impressive.
