Phet Fortress, (southeast island). This fortress was the city's most important defensive structure in the 15th century. Originally built of wood in 1350 by King Mahachakraphat, the fortress was later rebuilt with bricks. A few walls still remain and the grounds have a nice view of the river. The fortress is close to Wat Suwan Dararam, and is right beside a ferry that can take you to Wat Phanan Choeng.
