In Singapore, some kelongs also double as a restaurants with boats carrying guests to and from the buildings.
It attracts some 480,000 visitors annually.
The tower also acts as the Islamic falak observatory to observe the crescent moon which marks the beginning of Muslim month of Ramadhan, Syawal, and Zulhijjah, to celebrate fasting month of Ramadhan, Hari Raya Aidilfitri and Aidiladha.