Built in March 1884, during the reign of King Chulalongkorn (Rama V) to protect Siam from European colonial threats, Pom Phra Chulachomklao (ป้อมพระจุลจอมเกล้า), also called Phra Chulachomklao Fort, is a historic fortress in Samut Prakan, serving today as a heritage site with naval exhibits, a royal monument, and a retired warship museum, making it a fascinating day trip from Bangkok for history lovers and casual visitors alike.