The biggest Christmas tree in the world is the one that's currently located in Gwanghwamun Plaza, Seoul, South Korea. It stands at a towering height of 122 feet and is decorated with over 3 million LED lights. The tree was first erected in 1954 and has become a beloved symbol of the holiday season in Seoul. It's also one of the most photographed landmarks in the city, attracting visitors from all over the world.