The  (, ) is a proposed architectural project to build a 400-meter tall mammoth cube-shaped skyscraper in the al-Qirawan district of Riyadh, Saudi Arabia, one of the five neighborhoods of the planned real estate development of New Murabba. Launched in February 2023, its cuboidal layout and design are inspired by the Murabba Palace.

Background 
The massive undertaking was announced by the Kingdom's de facto ruler Crown Prince Mohammed bin Salman on February 16, 2023. The design has been the subject of some criticism for its similarity to the Kaaba at the Masjid al-Haram mosque in Mecca, Islam's holiest shrine. 

The interior as currently planned will feature enormous holographic projections aimed at making viewers feel as if they are in different realities, times, and places. The interior will also feature a swirling tower for observation decks and restaurants, from which the projections will emanate.

The Mukaab is planned to be the centerpiece of a giant new downtown built within the Saudi capital city of Riyadh called New Murabba. It will be the world's largest single-built structure with around 2 million square meters of interior floor space.

The project will be undertaken by the New Murabba Development Company of which Crown Prince Mohammed bin Salman is the President. 

The cube is intended to be 400 meters (1302 ft.) tall and 400 meters (1302 ft.) wide on each of its four sides.

Plans for the Cube are part of the Saudi Vision 2030 project.

The building's design is inspired by the modern Najdi architectural style.

The Mukaab will also feature a rooftop garden.

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Proposed skyscrapers
Skyscrapers in Saudi Arabia
Cubes