National Museum was designed in Neo-Palladian and Renaissance style and consists of two rectangular parallel blocks, with a dome at the front of the building.
Its architects were Henry McCallum who designed the original version and J.F. McNair who designed the scaled down version of the building.
The building has two rotundas, a new glass-clad rotunda at the rear area of the building.
Its glass rotunda is a cylindrical shaped building which is made up of two drums, with the outer one made of glass which sheaths an inner one made of wire mesh.
Black out curtains has the same length of the inner drum with images projected on sixteen video projectors in the day.
The curtains are drawn after sunset, and projection can be beamed out through the glass to get a view of the city.
Coats of arms are found on the building's front.

The redeveloped building was designed by local W Architects with the glass-clad rotunda designed inspired by Chinese American I.M. Pei.
The chief design consultant was Mok Wei Wei from W Architects, who was appointed in June 2004 and modified the designs of glass rotunda and the atrium between the two buildings.
The new glass clad building was designed such that the old building would still be the centrepiece of the museum.
A six-metre gap exists between the back of the main museum building and its new annexe as conservation guidelines do not allow old and new buildings to be directly connected.
In the gallery theatre, bricks are designed in a herringbone brick pattern, which helps to control the echoes and acoustics in the space.
Initially, the designers planned to use bricks from the old National Library building, but the cost was too expensive.
Black concrete flooring was used for the new block instead of grey granite flooring as initially planned.
National Museum was designed in Neo-Palladian and Renaissance style and consists of two rectangular parallel blocks, with a dome at the front of the building. Its architects were Henry McCallum who designed the original version and J.F. McNair who designed the scaled down version of the building. The building has two rotundas, a new glass-clad rotunda at the rear area of the building. Its glass rotunda is a cylindrical shaped building which is made up of two drums, with the outer one made of glass which sheaths an inner one made of wire mesh. Black out curtains has the same length of the inner drum with images projected on sixteen video projectors in the day. The curtains are drawn after sunset, and projection can be beamed out through the glass to get a view of the city. Coats of arms are found on the building's front.
The redeveloped building was designed by local W Architects with the glass-clad rotunda designed inspired by Chinese American I.M. Pei. The chief design consultant was Mok Wei Wei from W Architects, who was appointed in June 2004 and modified the designs of glass rotunda and the atrium between the two buildings. The new glass clad building was designed such that the old building would still be the centrepiece of the museum. A six-metre gap exists between the back of the main museum building and its new annexe as conservation guidelines do not allow old and new buildings to be directly connected. In the gallery theatre, bricks are designed in a herringbone brick pattern, which helps to control the echoes and acoustics in the space. Initially, the designers planned to use bricks from the old National Library building, but the cost was too expensive. Black concrete flooring was used for the new block instead of grey granite flooring as initially planned.
National Museum of Singapore