Phra Sumen Fort at Santi Chai Prakan Public Park in Bangkok

Phra Sumen Fort the riverfront fort built in 1783 with an octagonal bunker and white exterior/ Santhi Chai Prakan Park is in a small park Small, tranquil riverfront park, home to Phra Sumen Fort, offering vistas of Rama VIII Bridge.
The fortifications of Bangkok consist of several series of defensive structures built to protect the city during the late Ayutthaya to early Rattanakosin periods. The earliest structures were built when Bangkok was an outpost of Ayutthaya guarding entry to the Chao Phraya River during the 15th–16th centuries.