The Sultan Mosque or Masjid Sultan in Malay might be the most photographed mosque in Singapore. It looks so grand and beautiful and sometimes imposing too!
It looks good day or night and during the evening when the sun sets, it looks glorious! Information on Wikipedia says it is considered one of the most important mosque in Singapore.
It's designed by Irish architect Denis Santry of Swan and Maclaren. It took 4 years to be built and was completed in 1928.
It has been gazetted as a national monument on 14 March 1975.
I just realised that quite a few religious buildings in Singapore has been designed by this firm Swan and Maclaren. For example: Chesed-El Synagogue, Church of our Lady Lourdes, St Joseph's Church, Prinsep Street Presbyterian Church.