The Cathedral of Immaculate Conception is Thailand's largest cathedral, and it's found right here in Chanthaburi. As far as Chanthaburi attractions go, they don't get more impressive than this marvel of construction. The architecture and design of the cathedral lean towards a Gothic style and includes decorative features like stone sculptures and intricately painted stained-glass windows. In front of the cathedral's altar, you'll find one of the most well-crafted statues of the Virgin Mary in the country. This fantastic attraction is found right at the centre of Chanthaburi and should be a quick visit for anyone staying at one of the region's prominent hotels – say, for example, the Chatrium Golf & Resort Soi Dao Chanthaburi.