PM Narendra Modi will meet Brunei's ruler Sultan Hassanal Bolkiah at his official residence- the Istana Nurul Iman Palace- that is the world's largest residential palace. Built at a cost of around $1.4 billion, the palace spans 200,000 square meters, has 1,788 rooms, including 257 bathrooms. It also has five swimming pools and a central dome adorned with 22-carat gold.