Just an hour to an hour and a half travel from Bangkok, Ayutthaya is simply a stunning must-visit city. Known to be the former capital city of Siam, the ruins of the old city are preserved in the Ayutthaya Historical Park—a UNESCO World Heritage Site. From Bangkok to Ayutthaya, this can be explored by land or by water since the splendid Chao Phraya River stretches all over this city.