Ayuthaya Ruins, Bangkok
These ruins are amazing to see. Very old and they also contain Buddha's relics. I really neat experience. It's approximately 1.5 hrs away from Bangkok and should cost about 1500 BHT to and from Bangkok in a taxi, including the tolls.
This photo of Ayuthaya Ruins is courtesy of TripAdvisor
This photo of Ayuthaya Ruins is courtesy of TripAdvisor
This photo of Ayuthaya Ruins is courtesy of TripAdvisor