Phra Sumen Fort
Built in 1782 to protect newly founded capital of Thailand, Phra Sumen Fort has three levels and many storage rooms. It is around 20 metres tall and 45 metres wide, and you will see it if you are going from the Khao San Road to the Phra Arthit Road. The fort was built of masonry, which is one of the main reasons it managed to survive for 200 years before it got renovated. You can also visit the national museum located on the third level and enjoy the view of the city and river. Today, the fort is considered a monument of national importance.