Toshogu Shrine is a must-visit attraction in Nikko. It is a UNESCO World Heritage site and is dedicated to Tokugawa Ieyasu, the founder of the Tokugawa shogunate. The shrine complex is known for its intricate and ornate architecture, featuring vibrant colors and detailed carvings. Explore the various buildings within the complex, including the Yomeimon Gate, which is considered one of Japan's most beautiful gates. Don't miss the famous 'See no evil, hear no evil, speak no evil' monkeys carved on one of the buildings.