I went to visit Ayutthaya and Lopburi last weekend. This city is not far from Bangkok. Took the morning train, paid only 15 baht and stayed over for a night. I only spent just 30usd for 2 days and 1 night. Here are some photos that I took!
Wat Chaiwatthanaram
Wat Mahathat
Lopburi - Monkey Temple
Train to Ayutthaya
HOSTEL - ALL SUM HOSTEL (Ayutthaya)