National Sejong Arboretum is an urban arboretum next to Sejong Lake Park that displays plants from around the world. At the Four Seasons Exhibition Greenhouse, visitors can see tropical and Mediterranean plants, and also tour a Korean traditional garden that recreates the beauty of Changdeokgung Palace. The Four Seasons Exhibition Greenhouse is a large greenhouse shaped like an iris, with photo zones throughout and a pavilion beneath a pond. The site is large, so seeing all of it takes more than three hours.