all palace gates. Donhwamun was burned down during the Japanese invasion of 1592 and was restored in 1608. Geumcheongyo Bridge – Oldest bridge still extant in Seoul. Built 1411. Injeongjeon Hall (National Treasure) – The throne hall of Changdeokgung, it was used for major state affairs including the coronation of a new king and receiving foreign envoys. Originally built in 1405, it was rebuilt in 1610 after being burned down during the 1592 Japanese invasion, and a third time in 1804 after being destroyed by a fire. Seonjeongjeon Hall – An office for ruling officials. The king held daily meetings with ministers, reported on state affairs and seminars here. Huijeongdang Hall – Originally the king's bed chamber, it became his workplace after Seonjeongjeon was deemed too small for conducting routine state affairs. The original Huijeongdang was destroyed by a fire in 1917. The reconstructed structure is completely different from the original due to recent Western influences. Wooden floorboards and carpets, glass windows, and chandeliers can be seen inside the building. Daejojeon Hall – Official residence of the queen. Destroyed by fire in 1917, it was rebuilt with materials taken from Gyeongbokgung. Daejojeon was used as a residence for the last empress of Joseon, allowing us a glimpse into the final years of the royal household of the Joseon dynasty. Juhamnu Pavilion (Kyujanggak) – Royal libraries stood in this area. State exams were conducted in front of the pavilion on special occasions in presence of the king. Yeon-gyeongdang Residence – Built in 1827, it was an audience hall modeled after a typical literati house. Huwon Behind the palace lies the 78-acre (32 ha) Huwon (후원, 後苑, Rear garden) which was originally constructed for the use of the royal family and palace women. The garden incorporates a lotus pond, pavilions, and landscaped lawns, trees, and flowers. There are over 26,000 specimens of a hundred different species of trees in the garden and some of the trees behind the palace are over 300 years old. The garden for the private use of the king had been called 'Geumwon' (금원, 禁苑, Forbidden garden) because even high officials were not allowed to enter without the king's permission. It had also been called 'Naewon' (내원, 內苑, 'Inner garden'). Today Koreans often call it 'Biwon' (비원, 秘院, Secret garden) which derived from the office of same name in the late 19th century. Though the garden had many