Sultan Mosque
Also known as Masjid Sultan and the largest mosque in Singapore, the building is easily identified thanks to its golden domes, but there's not much to see inside. Note that shorts, short skirts or sleeveless T-shirts are not permissible attire, but you can borrow a cloak if needed.
Hajjah Fatimah Mosque
Also known as Masjid Hajjah Fatimah, it is probably Singapore's second most important mosque historically after Sultan Mosque. It was named after an aristocratic Malay woman who donated money to build it. Its design is a mix of local Malay Muslim and colonial British architecture. This minaret tower is also worth a look as it leans slightly off-centre towards the main prayer hall. As with all mosques, revealing clothing should be avoided.
Kwan Im Thong Hood Cho
Dedicated to Kuan Yin, the Goddess of Mercy. According to legend, wishes made in here come true, which would explain why it's always packed. The procedure goes like this: enter, light some joss sticks, pray, then shake a container of cham sibamboo sticks until one falls out. Get a free matching slip with verses also in English explaining your fate, and maybe take it to one of the resident soothsayers for more explanation.
Malay Heritage Centre
Set on the grounds of beautifully restored Istana Kampong Glam, the site looks gorgeous from the outside but despite some half-hearted attempts at whiz-bang multimedia, the museum inside is rather disappointing.