THAT DAM (BLACK STUPA) That Dam or Black Stupa in Vientiane Capital is one of the few ancient stupas that remains after the Siamese occupation in the 17th century. It is located in the center of the town and has become one of the most popular city landmarks. It is quite an interesting sight in the middle of what is quickly becoming a modern city. Since it has not undergone any renovation, vegetation has started to grow out of it which adds to its charm. According to legend, the Black Stupa was built in the 16th century and it is believed to be the home of the seven-headed dragon that struggled to protect Vientiane, her people, and the entire kingdom from Siamese invaders in 1827.