The first-ever sultan in Singapore was Sultan Hussein Shah and he built this amazing mosque in 1824. This is the biggest mosque in Singapore and the prayer hall inside this mosque can accommodate 5000 people at once. It's said that right after a century it was established, the mosque was renovated and for this task, even the poorest Muslim had made a contribution (a donation). The mosque is located in the Arab quarters, and right after visiting the mosque, you may also do some shopping around as the area has a lot of boutiques selling food, clothes, and many other souvenirs.