Wat Chiang Man is a Buddhist temple inside the old city (which is contained within the city walls and moat) of Chiang Mai. It was built by Mangrai in 1297 CE as the first temple of Chiang Mai on the location of Wiang Nopburi, a fortified town of the Lawa people which had been used by King Mangrai as a camp during the construction of his new capital city, Chiang Mai. The important features of Wat Chiang Man are:-
Chedi Chang Lom - the 'Elephant Chedi', the oldest construction within the temple complex
Main Wihan - the larger of the two wihans was renovated in the 1920s by the famous monk Khru Ba Srivichai
New Wihan - the smaller of the two wihans houses two important statues of the Buddha, Phra Sae Tang Khamani and Phra Sila
Ubosot - in front of the ubosot one can find a stone stele from the year 1581 CE. This stele contains the oldest mentioning of the founding date of Chiang Mai: the 12th of April, 1296
Ho Trai - the Temple Library (scripture depository)
Lotus Pond - as with Ho Trai, temple ponds do not feature at most Chiang Mai temples

Source: Wikipedia