Pratu Chum Phon is behind the Monument of Thao Suranari. It is an old city gate built during the reign of King Narai the Great in 1656. The king commanded that a strong city wall be built. Engineers from France, then an ally of the country, designed the city plan. Nakhon Ratchasima at that time was an outpost in the shape of a rectangle of 1,000 x 1,700 metres. The western Chum Phon Gate is the only 1 of 4 city gates that still stands. The other three gates have been rebuilt. Chum Phon Gate is built of large stones and bricks and covered with plaster. The top is a watchtower made of wood with a tiled roof and decorated in the Thai style.