Thailand's former capital, 85km north of Bangkok, with ancient temple ruins spread across a riverside island — ideal as a day trip or 1–2 night stay.
A UNESCO World Heritage Site where you can walk among 500-year-old temple ruins, some half-submerged in water, spanning an island surrounded by three rivers.
Train from Bangkok's central station (1.5 hours, 15 THB), or join a guided tour from your hotel (usually 8–10 hours total, 1,200–2,000 THB including lunch and guide).
Wat Chai Watthanaram (the most photographed, riverside), Wat Phra Sri Sanphet (three chedis, former royal temple), Wat Yai Chai Mongkhon (large reclining Buddha), and Wat Mahathat (famous tree-roots-through-Buddha-head photo).
November–February (cool season); avoid May–October (rainy and very hot).
Half-day barely scratches the surface — aim for a full day (leave Bangkok 7 AM, return 6 PM) or stay overnight to explore slowly.
Bicycle rental (50–100 THB/day) is the classic way to cover the site's spread-out ruins; tuk-tuks are a fine alternative for those who'd rather not cycle in the heat.