Phra Thinang Borom Phiman: built in the western style in 1903 by King Rama V for the Heir Apparent, the future King Rama VI, this mansion was also used at various times as a royal residence by King Rama VII (1925-1935), King Rama VIII (1935-1946), and the present King Rama IX. At present the Borom Phiman Mansion serves as the Royal Guest House for visiting Heads of State and guests of Their Majesties.