Samut Prakan means “ocean fortress” and it was built to protect the approach to Bangkok. One of the few remaining forts left is Phi Sua Samut Fort. It is situated on an island on the Chao Phraya River which is probably one of the reasons it is still in good condition. Other forts have long since been pulled down. At the Northern end of the island there is a bridge from the mainland. As well as exploring the fort, you can go along a boardwalk to visit hundreds of fruit bats in the trees.
Map for Phi Sua Samut Fort Island: