Touted as the world's largest golden teak building, the Vimanmek Mansion on the palace grounds was the home of King Rama V in the early 20th century. It was originally a summer retreat on the island of Ko Si Chang, but has been transported to Bangkok in small parts in 1901. A guided tour is compulsory and tells you all about the life of King Rama V, and about his collection of fin de siecle royal memorabilia placed inside the building. As King Rama V tried to modernise Thailand along European lines, you can also see the first Thai indoor bathroom, the first typewriter with Thai characters and some of the first portrait paintings of Thailand. Ananta Samakhom Throne Hall, built in Renaissance and neo-classical-style was intended to be used as a royal reception and assembly hall. The construction was completed in the reign of King Rama VI. The dome of the throne hall houses picturesque frescoes of royal activities undertaken during the reigns of King Rama I till King Rama VI. The building serves as a venue for royal and state ceremonies and was used as the National Assembly before it was moved to the current building behind it. Currently it houses beautiful arts and crafts made with traditional Thai techniques.