What exactly is Gwanghwamun, the royal gate BTS just introduced to the world?

What exactly is Gwanghwamun, the royal gate BTS just introduced to the world?

Sometime Saturday, you may find yourself watching a livestream of seven singers performing on a massive outdoor stage in central Seoul, framed by a towering wooden gate and the sweeping tiled rooftops of a palace behind it. You might wonder: What, exactly, is that thing? What you're seeing is Gwanghwamun, historically the main entrance to Gyeongbokgung — the grand royal palace of the Joseon era, which ruled Korea from 1392 until the Japanese annexation of 1910. It is, by most reasonable measures

By The Korea Herald