Built in 1846 on request of King Nangklao (Rama III) and inspired by two other similar temples found in India and Sri Lanka, Loha Prasat is a 36 m high construction supporting 37 metal spires representing the 37 virtues toward enlightenment. The temple is erected in a very unusual way with multiples concentric square levels built on geometrically aligned pillars. A relic of lord Buddha is kept at the highest level.
Loha Prasat is the Indian name dating from the time of Buddha, refering to a multi-storey and square based construction with metal spires and originally used as Monk's quarters. Only three such constructions ever existed in the world but only the one in Bangkok is still standing.