Wat Ong Teu Mahawihan, also known as the Temple of the Heavy Buddha, is a significant Buddhist monastery located in the heart of Vientiane, the capital city of Laos. The temple's history dates back to the 16th century during the reign of King Setthathirath. Its name is derived from the large, bronze Phra Ong Teu Buddha image housed within its precincts, which is believed to contain powerful spiritual energy. The monastery has been reconstructed several times due to damage caused by foreign invasions and natural disasters over the centuries. Wat Ong Teu is not just a place of worship but also an important center of Buddhist education. It serves as one of the national centers for Buddhist studies in Laos. The complex features a rich architectural design reflective of Lao culture, with intricate carvings, gilded elements, and traditional Lao stupas. The temple grounds are serene and offer a peaceful retreat from the bustle of the city. Visitors can wander through and observe monks in their daily activities and gain insight into their way of life. The temple is an essential site for cultural and religious ceremonies, particularly during the Lao New Year festival.