Siriyalai Palace, in Ayutthaya
I believe it is the name of the Queen's palace on the bank of Chao Phraya River, across the river to Wat Chaiwatanaram .
I am not sure how to pronounce it correctly in Thai alphabets since I got this name from Bangkok Post today. Just posted it here as reminder for myself via widget. Perhaps it is spelled as สิริยาลัย