Plong Liam is a significant historic landmark located along the Tha Chin River within the Ban Plong Liam School grounds in Samut Sakhon, featuring a 30-meter-tall octagonal brick chimney built during the reign of King Rama III (1824) for a Portuguese-owned sugar factory, reflecting the prosperity of the past sugar industry. Today, the chimney is registered as a national ancient monument by the Fine Arts Department and serves as a historical symbol of the arrival of Western technology during the early Rattanakosin period. The area around Plong Liam remains lush and tranquil, making it an intriguing check-in spot for history enthusiasts and photographers looking to capture ancient riverside architecture.