It is not your conventional historical artefacts that you would find here, despite the exterior of the building looking quite ancient. The museum is dedicated to the history of Thai; its people and the evolution of their traditions.
It starts off with the beginning of Ayutthaya (the first capital) and spirals across history, the wars, Buddhism and smoothly merges into modern-day Thailand. It is pretty much like travelling through time. Not only does it exhibit the evolution of the country and traditions but also the evolution of television and their programmes. This part of the tour definitely would make any local feel nostalgic. There's also a set up of a typical Bangkok café from the 1960s, in which you can choose to be either the waitress or customer and take many fun pictures.
Once you are outside, do not forget to visit the shop next to the souvenir boutique, which is also part of the exhibit. Take a peek and ask to see the fridge; a surprise awaits you!