Also known as Wat Prayun for short, it was built during the reign of Rama III – started in 1828 and finished seven years later. After that, the large white stupa was added by King Mongkut. You can walk inside the outer ring of smaller stupas and ascend via a narrow stairwell, giving you a view towards the river. Perhaps the best-known part of the wat is the 180-year-old adjoining gardens where the mountain rockery, Khao Mo, represents the cosmic Mount Meru. Feeding the turtles in the lake may well bring merit too. Before you enter the main stupa, you pass through a small museum which was founded in 1885 and exhibits all manner of Buddhist figurines, amulets and votive tablets dating from the Ayutthaya period. This collection was augmented in 2007 by the discovery of even older relics (from the 1300s onwards) when renovating the site. The main ubosot is richly decorated with colourful murals and a striking gold Buddha which was worked on by Japanese craftsmen. The wat is a 20 minute walk, or taxi ride from Itsaraphap MRT Station,