Laos is best known for its beautiful wats or Buddhist temples, many of them very old. Amongst the most famous wats in Vientiane are Wat Si Sak (the oldest temple in the city), Pha That Luang - which is more than a Buddhist temple or stupa- it’s also symbolic of the country’s sovereignty; and Wat Pha Kaew, a museum that was once a royal shrine. 24 km from Vientiane is the Wat Xieng Khuan housing a good collection of sculptures, both Buddhist and Hindu in origin.
Luang Prabang was, once upon a time, the capital of Laos, and even though it wasn’t an extremely large city, it had (at the time) 66 temples. Only 32 of these temples stand today but they’re worth a visit.  Wat XiengThong, Luang Prabang

Luang Prabang itself is one of the most scenic parts of Laos, situated as it is at the confluence of the Mekong and Khan rivers and surrounded by picturesque mountains. Some of the `don’t-miss’ sights of Luang Prabang include the lovely Kuang Si waterfalls, the Pak Ou Caves (unusual Buddhist temples- the caves actually house shrines), the Wat Wisunlat, the Wat Xieng Thong, and the Royal Palace Museum.