Buckingham Palace has early 20th-century exterior designs.
Buckingham Palace . The last major structural additions were made in the late 19th and early 20th centuries , including the East front , which contains the well-known balcony on which the royal family traditionally congregates to greet crowds . The original early 19th-century interior designs , many of which survive , include widespread use of brightly coloured scagliola and blue and pink lapis , on the advice of Sir Charles Long .