Wat Yai Chai Mongkhon is one of Ayutthaya's most photogenic temple complexes, dominated by a tall bell-shaped chedi that you can climb for views over the grounds. Rows of saffron-draped Buddha images line the courtyard, giving the site a strong visual rhythm even when tour groups are moving through.
It sits slightly outside the central island, so many visitors see it by bicycle, tuk-tuk, or as part of a broader ruins loop. Come early if you want quieter photographs, and leave time for the reclining Buddha and smaller corners of the monastery rather than rushing straight to the chedi.