Wikitravel - Nakhon Pathom (Bangkok Day-trip) Phra Pathom Chedi. Towering over the low-rises of central Nakhom Pathom, at 120 meters this massive brick stupa is the largest in the world. It also makes a respectable claim to being Thailand's oldest Buddhist temple, dating back to the 6th century AD, although the present structure is mostly the handiwork of King Mongkut (1853) and his successors. in Travel > Asia > Thailandwith bangkokthailandtravel