Buildings and structures completed in 2021

The Marble Arch Mound or Marble Arch Hill was a temporary, 25-metre-high (82 ft) artificial hill located next to Marble Arch in London, England. It had a viewing platform on the summit and an events space inside. The hill opened to the public on 26 July 2021, with a charge, but shortly afterwards it was briefly closed after complaints from the first visitors. It re-opened in August without an entrance fee. It remained open to the public until 9 January 2022, and was subsequently dismantled.

The Turkish House (also called Turkevi Center) is a 561-foot-high (171 m), 36-floor skyscraper located at 821 United Nations Plaza (First Avenue) in Turtle Bay, Manhattan, New York City, United States, across from the headquarters of the United Nations. Turkish House serves as the headquarters of multiple Turkish diplomatic missions in New York City, as well as a center of Turkish cultural activity.

Quarry Trails Metro Park is a 220-acre (89 ha) metropolitan park in Columbus, Ohio, owned and operated by Columbus and Franklin County Metro Parks. The park opened on November 30, 2021, as Central Ohio's 20th metro park. Portions of the park remained under construction, although 200 acres opened, including a 25-foot waterfall, trails, boardwalks, and a zipline.

Distrito T-Mobile (initially developed as District Live!) is an entertainment and retail district complex located adjacent to the Puerto Rico Convention Center, part of a redevelopment of the Convention Center area that initially had opened in 2005. Distrito T-Mobile is 476,000 square feet complex of entertainment, dining, and shopping. It has 10 eateries, an 8-screen movie theater featuring IMAX, a 177 room Hotel, 2 Live Music venues, an outdoor performance plaza and an urban park featuring a zip line and a maze.

HALO Urban Regeneration is a Scottish business innovation park, urban regeneration and business start-up support company, founded, based and headquartered in Kilmarnock, East Ayrshire, Scotland. The HALO Urban Regeneration was founded by entrepreneur Marie Macklin CBE in 2006 as HALO Urban Regeneration Company Ltd., having announced the project a few years prior to official funding and creation of the HALO Kilmarnock.

Merthyr Tydfil bus station is the bus station that serves the town of Merthyr Tydfil, South Wales.

Westside Park at Bellwood Quarry is a park in the City of Atlanta located on the site of the former Bellwood Quarry. The park is between Johnson Road and Donald Lee Hollowell Parkway and between the neighborhoods of Bankhead, Grove Park, and Knight Park/Howell Station. A large portion of the park falls within the Grove Park boundaries. Westside Park at Bellwood Quarry was a major green space project of the Atlanta BeltLine master plan. The park has trail connectivity to the Proctor Creek Greenway Trail (Phase 1) and will ultimately have connectivity to the BeltLine.

Queens Place is an approved residential complex of twin skyscrapers, to be built on 350 Queen Street in Melbourne, Victoria. Upon completion, they will be amongst the tallest buildings in Melbourne, and the tallest twin skyscrapers in Australia.

Premier Tower is a mixed-use skyscraper on the corner of Bourke and Spencer Streets, in Melbourne, Australia.

Brisbane Quarter (also known as 300 George Street) is a development consisting of three buildings; residential apartments, an office tower and hotel tower, on the old Law Courts site bordered by George, Adelaide and Ann streets and North Quay in Brisbane, Australia.