It can be found in older / olden buildings in Singapore.
Looking at the this photo, you can see they use the small square tiles.
The older HDB flats like the conservation flats in Tiong Bahru have these spiral staircases as well. They are emergency exits and usually located at the back of the house, where the kitchen is.
I wonder why after certain years, they don't have the 2nd door or emergency exits for HDBs in Singapore?
