Visible for miles around, the huge, brick chedi of Wat Yai is a long walk (or a short bicycle ride) southeast of ancient Ayutthaya (across the river and out of town). King U Thong founded the temple in 1357, and the white reclining Buddha near the entrance was built by King Naresuan. The massive pagoda celebrates the defeat of the Burmese at Suphanburi in 1592, and King Naresuan’s triumph over the crown prince of Burma in an elephant joust. The rows of Buddha images draped in saffron robes make for Instagram-worthy photos. Stick around for sunset if you can—it’s a real experience to see the sun dip below the ancient ruins here. However sunset viewing is not exactly a well-kept secret, so arrive 30 minutes early to claim a spot.