This is a fascinating building. On the outside it looks just like a Christian cathedral. It even has a spire and stained glass windows. It is Wat Niwet Thammaprawat and was ordered to built by King Rama V in 1878. Once you go inside, you will realize that it is in fact a Thai temple with Buddha images. There was even a monk there when I visited. To go to this temple, you have to use a cable car as it is on an island in the middle of the river in Bang Pa-In District.