Bai Hu City (The old-fashioned city of Earth): Leader-Lee Taemin, This city is made like a Hanok village only on a much larger scale. This means that this is like a city from the Joseon Dynasty. It's very traditional but does have some modern things as well. The Lee Castle is a traditional Joseon castle nestled in the center of the city.
Cheong Nyong City (The tech city of Air): Leader-Hwang Hyunjin, this city is a rather high-tech/very magical feeling city on a cliff. It has hanging gardens of Babylon feel. The highest part of the city is a sort of temple dedicated to air and the heavens. The center of the city has the palace in the middle and then markets and the urban area growing outward, eventually suburbs and then a forest until it is absolutely barren at the edge/ cliff walls.
Xuanwu City(The floating city of Water): Leader- Ahn Daniel, this city is built around a waterfall. It is powered by hydro-electricity. The Ahn Castle sits atop the waterfall with Xuanwu spread out below.
Zhu Que City (The mountain city of Fire): Leader-Jeon Jungkook, this city is at the base of, built into, and going up a mountain. Jungkook's mansion is atop a cliff on the mountain.
Baem Tti City (The hidden city of the rebels): Leader: ?, this is a city built around a cave system. It is deep in the forest and hidden by greenery that grows along the top and sides as well as hangs over the entrance.