The present Treasury Building was built over a period of 33 years between 1836 and 1869. The east and center wings, designed by Robert Mills, architect of the Washington Monument and the Patent Office Building, comprise the first part of the building constructed between 1836 to 1842. The most architecturally impressive feature of the Mills design is the east colonnade running the length of the building. Each of the 30 columns is 36 feet tall and is carved out of a single piece of granite. The interior design of the east and center wings is classically austere, in keeping with the Greek Revival style.
Later additions were made to the original wings, beginning with the construction of the south wing from 1855 to 1860 and the west wing from 1855- 1864. The preliminary design of the wings was provided by Thomas Ustick Walter, architect of the Capitol dome, but architects Ammi B. Young and Isaiah Rogers refined the plans, designed the interior details, and supervised construction. While the exterior of the building was executed along the lines of the original Mills wings, the interiors of the later wings reflect changes in both building technology and aesthetic tastes. Iron columns and beams reinforced the building's brick vaults; the architectural detailing became much more ornate, following mid-nineteenth century fashion. The final addition to the Treasury Building was the north wing, built from 1867 to 1869. Its architect was Alfred B. Mullett. Similar in construction and decor to the south and west wings, the north wing is unique as the site of the Cash Room -- a two-story marble hall in which the daily financial business of the U.S. Government was transacted. The room opened in 1869 as the site of President Grant's inaugural reception.
The Treasury Building is the oldest departmental building in Washington and has had a great impact on the design of other governmental buildings. At the time of its completion, it was one of the largest office buildings in the world. It served as a barracks for soldiers during the Civil War and as the temporary White House for President Andrew Johnson following the assassination of President Lincoln in 1865. The Treasury Building is unquestionably a monument of continuing architectural and historical significance. In acknowledgment of the building's significance, Treasury was declared a National Historic Landmark in 1972.
Guided tours of the building are available free of charge. The tour features restored spaces such as the 1864 Burglar-Proof Vault and the marble Cash Room. Also on the tour is the restored office of Salmon P. Chase, Secretary of the Treasury during the Civil War and the temporary office used by President Andrew Johnson following Abraham Lincoln's assassination, which has been restored to its 1860s appearance.
References:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.