The Cathedral of the Immaculate Conception; the principal church of the Roman Catholic Diocese of Chanthaburi; is the largest church in Thailand.

Chanthaburi is celebrated across Thailand because of its heroic links with King Taksin the Great; the conqueror who fought back against the Burmese occupiers of Ayutthaya in 1767 and went on to re-establish Thai independence. Although Taksin only ruled briefly from his new capital at Thonburi (1768-82); his name remains greatly revered; and is commemorated across Chanthaburi in a number of shrines; monuments; parks and even a boat yard.