One thing’s for sure: no one in the West learns about Ayutthaya in history class, despite the fact that it was the largest city in the world in 1700. Most of today’s visitors go to see earlier history, though.
The ruins at Ayutthaya Historical Park date back to 1350. The park is expansive and from a different period and culture than renowned Angkor Wat, so don’t write it off before you go.
Trains from Bangkok leave frequently to make the 90-minute trip to Ayutthaya. In fact, most visitors arrive on a day trip but staying the night is even better.
You’ll get to see the temples in early morning and late afternoon, when they’re at their quietest. Sunset in particular is beautiful and a great reason not to leave too early.
Source : Forbes Advisor
Wat Yai Chai Mong Kol Ayutthaya 
Wat Yai Chai Mong Kol Ayutthaya 
Wat Mahathat Ayutthaya 
Ayutthaya > Ancient Palace
