"Look to the top of Seoul’s 860-foot-tall Namsan Mountain and you’ll see the N Seoul Tower, which rises an additional 777 feet. This aerial perch is the highest point in the city and offers incredible views. Far below, Seoul sprawls out like a toy wonderland, while, on a clear day, North Korea lurks on the horizon. N Seoul Tower also boasts the world’s highest mailbox, so after taking in the views, buy a postcard and send it to someone special."