The national symbol and most important religious monument of the country, That Luang is a three-layered gilded stupa. The current version dates from 1566, although it has been ransacked and renovated numerous times since then. Accessing the inner courtyard gives you a slightly closer view of the stupa, and lots of Buddha statues. Vientiane's most important festival, Bun That Luang, is held here in Nov on the night of the full moon. There are two temples beside That Luang: Wat That Luang Neua (north) and Wat That Luang Tai (south), which are being renovated.
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Victory Gate
A local rendition of the Arc de Triomphe. Besides having elaborate Buddhist embellishment, it differs from the original in having four gates instead of two and being just a bit higher to spite the French. Reasonably impressive from afar, a surprisingly frank English sign inside the monument labels it a "monster of concrete" when seen up close. The concrete was donated by the US, although it was supposed to go towards a new airport instead: hence the nickname "the Vertical Runway". The monument itself aside, the palm tree-lined park around it complete with fountains is quite pleasant though lacking of shade during the daytime. You can climb up to the 7th story, stairs only, for a nice view of central Vientiane and three levels of souvenir shops with less than enthusiastic sales people sitting about. It features a musical fountain nearby that attracts visitors from around Laos and Asia, as well as a World Peace Gong presented by Indonesia. Roving cameramen will be happy to charge you for photos near these attractions.
Cooperative Orthotic and Prosthetic Enterprise
This centre explores the Lao legacy of unexploded ordnance (UXO) and the National Rehabilitation Centre's efforts to expand prosthetic, orthotic, and rehabilitation services across the country. There are exhibits, and visitors can watch short films on the subject. Exhibits are appropriate for all ages. An excellent gift shop offers fun, offbeat souvenirs that support a good cause. Free parking.
Disney-esque and gaudy in set-up, one would not think that it's a religious compound. Despite its small size, the temple is very active. Followers believe that lifting the small Buddha statue 3 times from its cushion means that your prayers or questions will be answered. The city pillar is being housed in a pagoda-like structure now being constructed separately on another block northwest across the street.
That Dam
The mythical abode of a seven-headed dragon that protects Vientiane. It was renovated in 1995, but still has an attractive patina of age, and is slowly being overgrown again by lush grass vegetation. Take care as there have been dog attacks at night.
Sisaket Museum
With very contemplative ambience, probably the oldest standing temple in Vientiane and among the most atmospheric. Built in 1818 by Chao Anou in the Bangkok-style and hence left unsacked when much of Vientiane was razed in a Siamese raid in 1828. Within the cloister walls are hundreds of niches housing Buddha images large and small, made of wood, stone, silver and bronze. In the centre of the courtyard is a five-tier-roofed sim (ordination hall) housing yet more Buddha niches and beautiful, but fading murals of the Buddha's past lives.