Vimanmek Mansion is the largest . Its elaborate architectural style reflects a western influence. The building has two right-angled wings. Each wing is 60 metres long and 20 metres high. It is a three-storey building except for the part where the King resided, which is octagonal and has four-storeys. The ground floor is brick and cement while the upper floors are built of golden teakwood planks. There are altogether 31 exhibition rooms, some of which maintain the atmosphere of the past