Saudi Arabia is experiencing an unprecedented construction boom at the moment. Alongside its previously announced 170-km-long skyscraper and Qiddiya gigaproject, comes another incredibly ambitious project named the Mukaab. It will comprise a huge cuboid supertall skyscraper that hosts a twisting tower inside.

The Mukaab will reach a height of 400 m (1,312 ft), which puts it at around 41 in the world’s tallest rankings. However, it will also be just as long and wide, which makes it truly massive. Its decorative exterior is inspired by traditional Islamic architecture and it will be topped by a rooftop garden.

Its cavernous interior will have a floorspace of around 2 square kilometers (0.77 square miles), which the Saudi Government’s Public Investment Fund says would be theoretically large enough to hold 20 Empire State Buildings. Beyond its sheer size though, the most interesting thing about its interior is the large twisting tower that will be positioned at its center – think of it like a big box with a tower inside, essentially.

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