@Devora suggested I make a list of largest of things in the world. So here it is. Essentially, a list of largest architecture in the world. The list is in alphabetical order. Other than #2 & #7, I've visited all on this list.
Largest residential palace in the world. (2,152,782 square feet (200,000.0 m2)). Home of Sultan of Brunei.
According to International Business Times:"It contains 1788 rooms, 257 bathrooms, & a floor area of 2,152,782 square feet. Amenities include 5 swimming pools, and an air conditioned stable for the Sultan's polo ponies, a 110-car garage, a banquet hall that can be expanded to accommodate up to 4000 guests, and a mosque accommodating 1500 people.
The palace was built in 1984 at a cost of around $1.4 billion USD and has 564 chandeliers, 51000 light bulbs, 44 stairwells, and 18 elevators. It is also a home to a car collection that includes custom-made Ferraris and Bentleys as well as 165 Rolls-Royces."
Largest country in the world by population. 1.33 billion people live in China! That's almost 20% of world's population. In other words, of every 5 person in the world, there is 1 Chinese! Awesome!
See the full review, "As the tiger approaches".