Buildings and structures completed in the 20th century

The Itamaraty Palace (Portuguese: Palácio do Itamaraty) is a 19th-century building of great historical and artistic value located in the city of Rio de Janeiro, Brazil.

134–142 Houston Street, in the Historic District of Savannah, Georgia, is a building completed around 1926. Constructed of brick, the building stands at the corner of Houston Street and East York Street in the southeastern corner of Greene Square. It is currently occupied by a meditation clinic.

Redhills is Grade II listed headquarters building of the Durham Miners' Association (DMA) in Durham, England. Officially called Miners' New Hall, it is known as Redhills from its location on Redhills Lane in the City of Durham.

The West Side Elevated Highway (West Side Highway or Miller Highway, named for Julius Miller, Manhattan borough president from 1922 to 1930) was an elevated section of Route NY-9A running along the Hudson River in the New York City borough of Manhattan to the tip of the island. It was an elevated highway, one of the first urban freeways in the world, and served as a prototype for urban freeways elsewhere, including Boston's Central Artery.

64 Baker Street is a commercial property in Baker Street, central London. It was the address of the headquarters of the Special Operations Executive.

San Siro Stables, also known as Scuderie De Montel, were built in Milan between 1914 and 1924 by De Montel, a Jewish Milanese aristocrat. In 1938, following the application of racial laws in Italy, the government took possession of the buildings.

The Rietburg chairlift (German: Rietburgbahn) is a chair lift that runs from the village of Rhodt in the Palatinate region of Germany to the ruins of the medieval castle of Rietburg. The chairlift is the county of Südliche Weinstraße in the state of Rhineland-Palatinate.

The Bovill Opera House in Bovill, Latah County, Idaho, is a theatre believed to have been built in the first decade of the 20th century. It is currently listed on the National Register of Historic Places.

Goldwin Smith Hall is an academic building located at the center of the eastern side of the Arts Quad on the campus of Cornell University.

Casco Castle was a resort in South Freeport, Maine, United States. Built in 1903, it was intended to resemble a castle. Designed by William R. Miller and overlooking Casco Bay immediately to its east, it burned down in 1914. All that now remains is its 185-foot (56 m) tall stone tower, which is now on private property, inaccessible to the public. The tower can be viewed from Harraseeket Road, a few yards closer to the shoreline, or from Winslow Memorial Park, directly to the south across the Harraseeket River. The main part of the building was to the south, with the tower on its northern side, connected by a bridge.