Pha That Luang is a Buddhist stupa in Vientiane. It was built in the 16th century under King Setthathirat on the ruins of an earlier 13th century Khmer temple. Pha That Luang was destroyed by the Thai invasion in 1828, which was heavily damaged and left abandoned. A French explorer and architect came across the abandoned temple and made detailed sketches of the temple. It was not until 1900, when the French restored it to its original design. The architecture of the building includes many references to Lao culture and identity, and so has become a symbol of Lao nationalism. Relics of The Buddha are said to be contained here.