Wat Wisunalat (first page) is the oldest temple in Luang Prahbang.  Built in 1513, it has a collection of gilded wooden buddas in the main hall.  The most notable thing about this Wat is the Watermelon Pagoda (see if you can see the resemblance), so named because of its shape.

 

Wat Xieng Thong (temple of the golden city) on the other hand is just slightly newer (1560) than Wat Wisunalat but it is definitely the most impressive.  Situated on the junction of Mekong and the Nam Khan rivers (one shy of a "h"), it is believed that this is the site of the union of the two guardian water spirits or nagas.  Legend also has it that it is the site where two hermits placed the boundary stones for Luang Phrabang.

 

Anyway, the main building is covered in richly coloured black and gold designs, creating a wonderful photogenic entrance.  It also has some of the most colourful murals on the outer walls of its buildings.  Also within the complex is a smaller building that house the funeral vehicle used for the last King of Lao.

 

And in case you did notice that some of the names look Chinese (ie "Xieng"), you are right - descendants migrated south from China during the first millennium.