South Korea Namhansanseong West Gate Observatory (남한산성 서문전망대)

Best spot to take photos for a night view of Seoul. You can see the entire skyline of Seoul with the Lotte World Tower and N Seoul Tower together.
Namhansanseong (남한산성) was a fortress of the Joseon Dynasty, a historical site with a sad story about the surrender(1636) of a Joseon king.
The invaders established a new nation in China, called the Qing dynasty.
Now, this place is the best spot to take photos of Seoul city.
Because this place is crowded with photographers, you need to visit early if you want to use a tripod.

You need to check the weather especially visibility to take nice photos in this place. If you visit here in the best weather conditions, you can even see the sea.

If you ride a car, I recommend parking in the Namhansanseong rotary parking lot and walk about 30 minutes.
If you ride a subway, use the 8th line and take off at 'Namhansanseong Entrance Station(남한산성입구역)'. Then I recommended taking a taxi to 'Gookcheongsa(국청사)', an old temple near Namhansanseong's West Gate.