Here's a pic of Wat Pra Sing, another temple complex in the old town. After you've seen hundreds of temples (and when you come to Thailand, you will) you'll be able to tell the different architectural styles of the temples. This temple is a good example of a Lanna temple. One easy way of telling them apart from temples in central Thailand is that these are traditionally made of teak wood. Of course these also burned down all the time, so there aren't that many examples of the traditional building style left.